Chapter 85

||Pseu`do*hal"ter (?), n.; pl. Pseudohalteres (#). [NL. See Pseudo-, ||and Halteres.] (Zoˆl.) One of the rudimentary front wings of certain ||insects (Stylops). They resemble the halteres, or rudimentary hind ||wings, of Diptera.

Pseu"do-heart` (?), n. [Pseudo- + heart.] (Zoˆl.) Any contractile vessel of invertebrates which is not of the nature of a real heart, especially one of those pertaining to the excretory system.

Pseu`do-hy`per*thoph"ic (?), a. [Pseudo- + hypertrophic.] (Med.) Falsely hypertrophic; as, pseudo-hypertrophic paralysis, a variety of paralysis in which the muscles are apparently enlarged, but are really degenerated and replaced by fat.

Pseu*dol"o*gist (?), n. [Gr. &?;.] One who utters falsehoods; a liar.

Pseu*dol"o*gy (?), n. [Gr. &?;; pseydh`s false + &?; speech: cf. F. pseudologie.] Falsehood of speech. Arbuthnot.

Pseu`do-me*tal"lic (?), a. [Pseudo- + metallic.] Falsely or imperfectly metallic; -- said of a kind of luster, as in minerals.

Pseu`do-mon`o*cot`y*led"on*ous (?), a. [Pseudo- + monocotyledonous.] (Bot.) Having two coalescent cotyledons, as the live oak and the horse- chestnut.

Pseu"do*morph (?), n. [See Pseudomorphous.] 1. An irregular or deceptive form.

2. (Crystallog.) A pseudomorphous crystal, as a crystal consisting of quartz, but having the cubic form of fluor spar, the fluor crystal having been changed to quartz by a process of substitution.

Pseu`do*mor"phism (?), n. (Crystallog.) The state of having, or the property of taking, a crystalline form unlike that which belongs to the species.

Pseu`do*mor"phous (?), a. [Gr. &?;; pseydh`s false + &?; form: cf. F. pseudomorphe.] Not having the true form.

Pseudomorphous crystal, one which has a form that does not result from its own powers of crystallization.

||Pseu`do*nav`i*cel"la (?), n.; pl. PseudonavicullÊ (#). [NL.] (Zoˆl.) ||Same as Pseudonavicula.

||Pseu`do*na*vic"u*la (?), n.; pl. PseudonaviculÊ (#). [NL., fr. Gr. ||pseydh`s false + NL. navicula, a genus of diatoms. See Navicular.] ||(Zoˆl.) One of the minute spindle-shaped embryos of GregarinÊ and ||some other Protozoa.

||Pseu`do*neu*rop"te*ra (?), n. pl. [NL. See Pseudo-, and Neuroptera.] ||(Zoˆl.) division of insects (Zoˆl.) reticulated wings, as in the ||Neuroptera, but having an active pupa state. It includes the dragon ||flies, May flies, white ants, etc. By some zoˆlogists they are ||classed with the Orthoptera; by others, with the Neuroptera.

Pseu`do*neu*rop"ter*ous (?), a. (Zool.) Of or pertaining to the Pseudoneuroptera.

Pseu"do*nym (?), n. [Cf. F. pseudonyme. See Pseudonymous.] A fictitious name assumed for the time, as by an author; a pen name. [Written also pseudonyme.]

Pseu`do*nym"i*ty (?), n. The using of fictitious names, as by authors.

Pseu*don"y*mous (?), a. [Gr. &?;; pseydh`s false + &?;, &?;, a name: cf. F. pseudonyme. See Pseudo-, and Name.] Bearing a false or fictitious name; as, a pseudonymous work. -- Pseu*don"y*mous*ly, adv. -- Pseu*don"y*mous*ness, n.

Pseu`do-pe*rip"ter*al (?), a. [Pseudo- + peripteral: cf. F. pseudopÈriptËre.] (Arch.) Falsely or imperfectly peripteral, as a temple having the columns at the sides attached to the walls, and an ambulatory only at the ends or only at one end. -- n. A pseudo-peripteral temple. Oxf. Gloss.

||Pseu"do*pod (?), n. [Pseudo- + -pod.] 1. (Biol.) Any protoplasmic ||filament or irregular process projecting from any unicellular ||organism, or from any animal or plant call.

2. (Zoˆl.) A rhizopod.

Pseu`do*po"di*al (?), a. Of or pertaining to a pseudopod, or to pseudopodia. See Illust. of Heliozoa.

||Pseu`do*po"di*um (?), n.; pl. Pseudopodia (&?;). [NL.] Same as ||Pseudopod.

||Pseu`do*pu"pa (?), n.; pl. L. PseudopupÊ (#), E. Pseudopupas (#). ||[NL. See Pseudo-, and Pupa.] (Zoˆl.) A stage intermediate between the ||larva and pupa of bees and certain other hymenopterous insects.

Pseu`do*rhab"dite (?), n. [Pseudo- + Gr. &?; a rod.] (Zoˆl.) One of the peculiar rodlike corpuscles found in the integument of certain Turbellaria. They are filled with a soft granular substance.

Pseu`do-ro*man"tic (?), a. Pseudo- + romantic.] Falsely romantic.

The false taste, the pseudo-romantic rage.

De Quincey.

Pseu"do*scope (?), n. [Pseudo- + -scope.] (Opt.) An instrument which exhibits objects with their proper relief reversed; -- an effect opposite to that produced by the stereoscope. Wheatstone.

Pseu`do*scop"ic (?), a. (Opt.) Of, pertaining to, or formed by, a pseudoscope; having its parts appearing with the relief reversed; as, a pseudoscopic image.

||Pseu`do*scor`pi*o"nes (?), n. pl. [NL. See Pseudo-, and Scorpion.] ||(Zoˆl.) An order of Arachnoidea having the palpi terminated by large ||claws, as in the scorpions, but destitute of a caudal sting; the ||false scorpions. Called also Pseudoscorpii, and Pseudoscorpionina. ||See Illust. of Book scorpion, under Book.

Pseu"do*sphere` (?), n. [Pseudo- + sphere.] (Geom.) The surface of constant negative curvature generated by the revolution of a tractrix. This surface corresponds in non-Euclidian space to the sphere in ordinary space. An important property of the surface is that any figure drawn upon it can be displaced in any way without tearing it or altering in size any of its elements.

Pseu"do*spore` (?), n. [Pseudo- + spore.] (Bot.)A peculiar reproductive cell found in some fungi.

||Pseu`do*stel"la (?), n.; pl. -lÊ. [NL., fr. Gr. pseydh`s false + L. ||stella star.] (Astron.) Any starlike meteor or phenomenon. [R.]

||Pseu*dos"to*ma (?), n.; pl. Pseudostomata (#). [NL. See Pseudo-, and ||Stoma.] (Anat.) A group of cells resembling a stoma, but without any ||true aperture among them.

Pseu`do-sym*met"ric (?), a. (Crystallog.) Exhibiting pseudo-symmetry.

Pseu`do-sym"me*try (?), n. [Pseudo- + symmetry.] (Crystallog.) A kind of symmetry characteristic of certain crystals which from twinning, or other causes, come to resemble forms of a system other than that to which they belong, as the apparently hexagonal prisms of aragonite.

||Pseu`do*te*tram"e*ra (?), n. pl. [NL. See Pseudo-, and Tetramerous.] ||(Zoˆl.) A division of beetles having the fifth tarsal joint minute ||and obscure, so that there appear to be but four joints. -- ||Pseu`do*te*tram"er*al (#), a.

||Pseu`do*tin"e*a (&?;), n.; pl. PseudotineÊ (#). [NL. See Pseudo-, and ||Tinea.] (Zoˆl.) The bee moth, or wax moth (Galleria).

Pseu`do*tur"bi*nal (?), a. [Pseudo- + turbinal.] (Anat.) See under Turbinal.

Pseu*do"va*ry (?), n.; pl. Pseudovaries (#). [Pseudo- + ovary.] (Zoˆl.) The organ in which pseudova are produced; -- called also pseudovarium.

||Pseu*do"vum (?), n.; pl. Pseudova (#). [NL. See Pseudo-, and Ovum.] ||(Zoˆl.) An egglike germ produced by the agamic females of some ||insects and other animals, and by the larvÊ of certain insects. It is ||capable of development without fertilization. See Illust. of ||PÊdogenesis.

Pshaw (?), interj. [Of imitative origin.] Pish! pooch! -- an exclamation used as an expression of contempt, disdain, dislike, etc. [Written also psha.]

Pshaw (?), v. i. To express disgust or contemptuous disapprobation, as by the exclamation " Pshaw!"

The goodman used regularly to frown and pshaw wherever this topic was touched upon.

Sir W. Scott.

Psi`lan*throp"ic (?), a. [see Psilanthropist.] Pertaining to, or embodying, psilanthropy. "A psilanthropic explanation." Coleridge.

Psi*lan"thro*pism (?), n. Psilanthropy.

Psi*lan"thro*pist (?), n. [Gr. &?; bare, mere + &?; a man.] One who believes that Christ was a mere man. Smart.

Psi*lan"thro*py (?), n. The doctrine of the merely human existence of Christ.

Psi*lol"o*gy (?), n. [Gr &?; mere + - logy.] Love of empty of empty talk or noise. Coleridge.

Psi*lom"e*lane (?), n. [Gr. &?; bare + &?;, &?;, black.] (Min.) A hydrous oxide of manganese, occurring in smooth, botryoidal forms, and massive, and having an iron-black or steel-gray color.

||Psi`lo*pÊ"des (?), n. pl. [NL., from Gr.&?; bare + &?;, &?;, ||offspring.] (Zoˆl.) birds whose young at first have down on the ||pterylÊ only; - - called also GymnopÊdes.

Psi`lo*pÊd"ic (?), a. (Zoˆl.) Having down upon the pterylÊ only; -- said of the young of certain birds.

Psi*los"o*pher, n. [Gr. &?; bare, mere + &?; wise.] A superficial or narrow pretender to philosophy; a sham philosopher.

{ Psit*ta"ceous (?), Psit"ta*cid (?), } a. [L. psittacus a parrot, Gr. &?;: cf. F. psittacide.] (Zoˆl.) Of or pertaining to the parrots, or the Psittaci. -- n. One of the Psittaci.

||Psit"ta*ci (?), n. pl. [NL.] (Zoˆl.) The order of birds which ||comprises the parrots.

Psit`ta-co-ful"*vine (?), n. [Gr. &?; a parrot + L. fulvus yellow.] A yellow pigment found in the feathers of certain parrots.

Pso"as (?), n. [Gr. &?; a muscle of the loin: cf. f. psoas.] (Anat.) An internal muscle arising from the lumbar vertebrÊ and inserted into the femur. In man there are usually two on each side, and the larger one, or great psoas, forms a part of the iliopsoas.

||Pso"ra (?), n. [L., fr. Gr. &?;.] (Med.) A cutaneous disease; ||especially, the itch.

||Pso*ri"a*sis (?), n. [NL., fr. Gr. &?;, fr. &?; psora.] (Med.) (a) ||The state of being affected with psora. [Obs.] (b) A cutaneous ||disease, characterized by imbricated silvery scales, affecting only ||the superficial layers of the skin.

Pso"ric (?), a. [L. psoricus, Gr. &?;: cf. F. psorique.] (Med.) Of or pertaining to psora.

Pso"ro*sperm (?), n. [Gr. &?; itching + &?; seed.] (Zoˆl.) A minute parasite, usually the young of GregarinÊ, in the pseudonavicula stage.

Psy`cha*gog"ic (?), a. [Gr. &?;. See Psychagogue.] Attractive; persuasive. J. Morley.

Psy"cha*gogue (?), n. [Gr.&?;; &?; the soul + &?; to lead.] A necromancer. [R.]

Psy"chal (?), a. [See Psychical.] Of or pertaining to the soul; psychical. Bayne.

Psy"che (?), n. [L., fr. Gr. PSychh` Psyche, fr. psychh` the soul.] 1. (Class Myth.) A lovely maiden, daughter of a king and mistress of Eros, or Cupid. She is regarded as the personification of the soul.

2. The soul; the vital principle; the mind.

3. [F. psychÈ.] A cheval glass.

Psy"chi*an (?), n. (Zoˆl.) Any small moth of the genus Psyche and allied genera (family PsychidÊ). The larvÊ are called basket worms. See Basket worm, under Basket.

{ ||Psy*chi`a*tri"a (?), Psy*chi"a*try (?), } n. [NL. psychiatria, fr. Gr. &?; the mind + &?; healing.] (Med.) The application of the healing art to mental diseases. Dunglison.

Psy`chi*at"ric (?), a. (Med.) Of or pertaining to psychiatria.

{ Psy"chic (?), Psy"chic*al (?), } a. [L. psychicus, Gr. &?;, fr. psychh` the soul, mind; cf. &?; to blow: cf. F. psychique.] 1. Of or pertaining to the human soul, or to the living principle in man.

This term was formerly used to express the same idea as psychological. Recent metaphysicians, however, have employed it to mark the difference between psychh` the living principle in man, and pney^ma the rational or spiritual part of his nature. In this use, the word describes the human soul in its relation to sense, appetite, and the outer visible world, as distinguished from spiritual or rational faculties, which have to do with the supersensible world. Heyse.

2. Of or pertaining to the mind, or its functions and diseases; mental; -- contrasted with physical.

Psychical blindness, Psychical deafness (Med.), forms of nervous disease in which, while the senses of sight and hearing remain unimpaired, the mind fails to appreciate the significance of the sounds heard or the images seen. -- Psychical contagion, the transference of disease, especially of a functional nervous disease, by mere force of example. -- Psychical medicine, that department of medicine which treats of mental diseases.

Psy"chics (?), n. Psychology.

Psy"chism (?), n. [Cf. F. psychisme.] (Philos.) The doctrine of Quesne, that there is a fluid universally diffused, end equally animating all living beings, the difference in their actions being due to the difference of the individual organizations. Fleming.

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Psy"cho- (?). A combining form from Gr. psychh` the soul, the mind, the understanding; as, psychology.

Psy`cho*gen"e*sis (?), n. Genesis through an internal force, as opposed to natural selection.

Psy*chog"ra*phy (?), n. [Psycho- + -graphy.] 1. A description of the phenomena of mind.

2. (Spiritualism) Spirit writing.

{ Psy`cho*log"ic (?), Psy`cho*log"ic*al (?), } a. [Cf. F. psychologique.] Of or pertaining to psychology. See Note under Psychic. -- Psy`cho*log"ic*al*ly, adv.

Psy*chol"o*gist (?), n. [Cf. F. psychologiste.] One who is versed in, devoted to, psychology.

Psy"cho*logue (?), n. A psychologist.

Psy*chol"o*gy (?), n. pl. Psychologies (&?;). [Psycho- + -logy: cf. F. psychologie. See Psychical.] The science of the human soul; specifically, the systematic or scientific knowledge of the powers and functions of the human soul, so far as they are known by consciousness; a treatise on the human soul.

Psychology, the science conversant about the phenomena of the mind, or conscious subject, or self.

Sir W. Hamilton.

Psy*chom"a*chy (?), n. [L. psychomachia, fr. Gr. psychh` the soul + &?; fight: cf. &?; desperate fighting.] A conflict of the soul with the body.

Psy"cho*man`cy (?), n. [Psycho- + -mancy: cf. F. psychomancie.] Necromancy.

Psy*chom"e*try (?), n. [Psycho- + -metry.] (Physiol.) The art of measuring the duration of mental processes, or of determining the time relations of mental phenomena. -- Psy`cho*met"ric (#), a.

Psy`cho-mo"tor (?), a. [Psycho- + motor.] Of or pertaining to movement produced by action of the mind or will.

Psy"cho*pan"ny*chism (?), n. [Psycho- + Gr. &?; to spend all night long; &?;, &?;, all + &?; night.] (Theol.) The doctrine that the soul falls asleep at death, and does not wake until the resurrection of the body. -- Psy`cho*pan"ny*chism (#), n.

Psy*chop"a*thy (?), n. [Psycho- + Gr. &?;, &?;.] (Med.) Mental disease. See Psychosis, 2. -- Psy`cho*path"ic, a. -- Psy*chop"a*thist, n.

Psy`cho*phys"ic*al (?), a. Of or pertaining to psychophysics; involving the action or mutual relations of the psychical and physical in man.

Psychophysical time (Physiol.), the time required for the mind to transform a sensory impression into a motor impulse. It is an important part of physiological or reaction time. See under Reaction.

Psy`cho*phys"ics (?), n. [Psycho- + physics.] The science of the connection between nerve action and consciousness; the science which treats of the relations of the psychical and physical in their conjoint operation in man; the doctrine of the relation of function or dependence between body and soul.

Psy"cho*pomp (?), n. [Gr. &?;; psychh` the soul + &?; to send: cf. F. psychopompe.] (Myth.) A leader or guide of souls . J. Fiske.

Psy*cho"sis (?), n. [NL. See Psycho- .]

1. Any vital action or activity. Mivart.

2. (Med.) A disease of the mind; especially, a functional mental disorder, that is, one unattended with evident organic changes.

Psy`cho*zo"ic (?), a. [Psycho- + Gr. &?; life.] (Geol.)Designating, or applied to the Era of man; as, the psychozoic era.

Psy*chrom"e*ter (?), n. [Gr. psychro`s cold + -meter: cf. F. psychromËtre.] An instrument for measuring the tension of the aqueous vapor in the atmosphere, being essentially a wet and dry bulb hygrometer.

Psy`chro*met"ric*al (?), a. Of or pertaining to the psychrometer or psychrometry.

Psy*chrom"e*try (?), n. Hygrometry.

||Psyl"la (?), n.; pl. PsyllÊ (#). [NL., from Gr. &?; a flea.] (Zoˆl.) ||Any leaping plant louse of the genus Psylla, or family PsyllidÊ.

Ptar"mi*gan (?), n. [Gael. tarmachan; cf. Ir. tarmochan, tarmonach.] (Zoˆl.) Any grouse of the genus Lagopus, of which numerous species are known. The feet are completely feathered. Most of the species are brown in summer, but turn white, or nearly white, in winter.

They chiefly inhabit the northern countries and high mountains of Europe, Asia, and America. The common European species is Lagopus mutus. The Scotch grouse, red grouse, or moor fowl (L. Scoticus), is reddish brown, and does not turn white in winter. The white, or willow, ptarmigan (L. albus) is found in both Europe and America.

||Pte`no*glos"sa (?), n. pl. [NL., fr. Gr.&?; feathered + &?; tongue.] ||(Zoˆl.) A division of gastropod mollusks having the teeth of the ||radula arranged in long transverse rows, somewhat like the barbs of a ||feather.

Pte`no*glos"sate (?), a. (Zoˆl.) Of or pertaining to the Ptenoglossa.

Pte*ran"o*don (?), n. [Gr. &?; wing + &?; priv. + &?;, &?;, a tooth.] (Paleon.) A genus of American Cretaceous pterodactyls destitute of teeth. Several species are known, some of which had an expanse of wings of twenty feet or more.

||Pte*ran`o*don"ti*a (?), n. pl. [NL.] (Paleon.) A group of ||pterodactyls destitute of teeth, as in the genus Pteranodon.

||Pte*rich"thys (?), n. [NL., fr. Gr. &?; wing + &?; fish.] (Paleon.) A ||genus of Devonian fossil fishes with winglike appendages. The head ||and most of the body were covered with large bony plates. See ||Placodermi.

Pter`i*dol"o*gist (?), n. One who is versed in pteridology.

Pter`i*dol"o*gy (?), n. [Gr. &?;, &?;, a fern + -logy.] That department of botany which treats of ferns.

Pter`i*do*ma"ni*a (?), n. [Gr. &?;, &?;, a fern + E. mania.] A madness, craze, or strong fancy, for ferns. [R.] C. Kingsley.

||Pter`i*doph"y*ta (?), n. pl. [NL., from Gr. &?;, &?;, a fern + &?; a ||plant.] (Bot.) A class of flowerless plants, embracing ferns, ||horsetails, club mosses, quillworts, and other like plants. See the ||Note under Cryptogamia. -- Pter"i*do*phyte` (#), n.

This is a modern term, devised to replace the older ones acrogens and vascular Cryptogamia.

||Pter`o*bran"chi*a (?), n. pl. [NL., fr. Gr. &?; a wing + &?; &?;.] ||(Zoˆl.) An order of marine Bryozoa, having a bilobed lophophore and ||an axial cord. The genus Rhabdopleura is the type. Called also ||Podostomata. See Rhabdopleura.

||Pte*roc"e*ras (?), n. [NL., fr. Gr. &?; a wing + &?; a horn.] (Zoˆl.) ||A genus of large marine gastropods having the outer border of the lip ||divided into lobes; -- called also scorpion shell.

||Pter`o*cle"tes (?), n. pl. [NL., fr Pterocles, the typical genus, fr. ||Gr. &?; feather + &?;, &?;, a key, tongue of a clasp.] (Zoˆl.) A ||division of birds including the sand grouse. They are in some ||respects intermediate between the pigeons and true grouse. Called ||also PteroclomorphÊ.

Pter`o*dac"tyl (?), n. [Gr. &?; a wing + &?; finger, toe: cf. F. ptÈrodactyle.] (Paleon.) An extinct flying reptile; one of the Pterosauria. See Illustration in Appendix.

||Pter`o*dac"ty*li (?), n. pl. [NL.] (Paleon.) Same as Pterosauria.

Pter`o*glos"sal (?), a. [Gr. &?; a feather + &?; tongue.] (Zoˆl.) Having the tongue finely notched along the sides, so as to have a featherlike appearance, as the toucans.

Pte"ron (?), n. [NL., fr. Gr. &?; a wing.] (Anat.) The region of the skull, in the temporal fossa back of the orbit, where the great wing of the sphenoid, the temporal, the parietal, and the frontal hones approach each other.

||Pter`o*pap"pi (?), n. pl. [NL., from Gr. &?; a feather, a bird + &?; ||a grandfather.] (Zool.) Same as OdontotormÊ.

Pter"o*phore (?), n. [Gr. &?; a feather + &?; to bear.] (Zoˆl.) Any moth of the genus Pterophorus and allied genera; a plume moth. See Plume moth, under Plume.

Pter"o*pod (?), n. [Gr. &?; wing-footed; &?; a feather, wing + &?;, &?;, foot: cf. F. ptÈropode.] (Zoˆl.) One of the Pteropoda.

||Pte*rop"o*da (?), n. pl. [NL.] (Zoˆl.) A class of Mollusca in which ||the anterior lobes of the foot are developed in the form of broad, ||thin, winglike organs, with which they swim at near the surface of ||the sea.

The Pteropoda are divided into two orders: Cymnosomata, which have the body entirely naked and the head distinct from the wings; and Thecosomata, which have a delicate transparent shell of various forms, and the head not distinct from the wings.

Pte*rop"o*dous (?), a. (Zoˆl.) Of or pertaining to the Pteropoda.

Pter"o*saur (?), n. [Gr. &?; wind + &?; a lizard.] (Paleon.) A pterodactyl.

||Pter`o*sau"ri*a (?), n. pl. [NL.] (Paleon.) An extinct order of ||flying reptiles of the Mesozoic age; the pterodactyls; -- called also ||Pterodactyli, and Ornithosauria.

The wings were formed, like those of bats, by a leathery expansion of the skin, principally supported by the greatly enlarged outer or " little" fingers of the hands. The American Cretaceous pterodactyls had no teeth. See Pteranodontia, and Pterodactyl.

Pter`o*sau"ri*an (?), a. (Paleon.) Of or pertaining to the Pterosauria.

||Pter`o*stig"ma (?), n.; pl. Pterostigmata (#). [NL., fr. Gr. &?; wing ||+ &?;, &?;, a mark.] (Zoˆl.) A thickened opaque spot on the wings of ||certain insects.

Pte*ro"tic (?), a. [Gr. &?; wing + &?;, &?;, ear.] (Anat.) Of or pertaining to, or designating, a bone between the proˆtic and epiotic in the dorsal and outer part of the periotic capsule of many fishes. -- n. The pterotic bone.

The pterotic bone is so called because fancied in some cases to resemble in form a bird's wing

||Pte*ryg"i*um (?), n.; pl. E. Pterygiums (#), L. Pterygia (#). [NL., ||fr. Gr. &?;, properly a dim, akin to &?; a feather.] (Med.) A ||superficial growth of vascular tissue radiating in a fanlike manner ||from the cornea over the surface of the eye.

Pter"y*goid (?), a. [Gr. &?;, &?;, a wing + -oid.] (Anat.) (a) Like a bird's wing in form; as, a pterygoid bone. (b) Of, pertaining to, or in the region of, the pterygoid bones, pterygoid processes, or the whole sphenoid bone. -- n. A pterygoid bone.

Pterygoid bone (Anat.), a bone which corresponds to the inner plate of the pterygoid process of the human skull, but which, in all vertebrates below mammals, is not connected with the posterior nares, but serves to connect the palatine bones with the point of suspension of the lower jaw. -- Pterygoid process (Anat.), a process projecting downward from either side of the sphenoid bone, in man divided into two plates, an inner and an outer. The posterior nares pass through the space, called the pterygoid fossa, between the processes.

Pter`y*go*max"il*la*ry (?), a. [Pterygoid + maxillary.] (Anat.) Of or pertaining to the inner pterygoid plate, or pterygoid bone, and the lower jaw.

Pter`y*go*pal"a*tine (?), a. [Pterygoid + palatine.] (Anat.) Of or pertaining to the pterygoid processes and the palatine bones.

||Pter`y*go*po"di*um (?), n.; pl. Pterygopodia (#). [NL., fr. Gr. &?;, ||&?;, a fin + &?;, dim. of &?;, &?;, a foot.] (Anat.) A specially ||modified part of the ventral fin in male elasmobranchs, which serves ||as a copulatory organ, or clasper.

Pter`y*go*quad"rate (?), a. [Pterygoid + quadrate.] (Anat.) Of, pertaining to, or representing the pterygoid and quadrate bones or cartilages.

||Pte*ry"la (?), n.; pl. PterylÊ (#). [NL., fr. Gr. &?; feather + &?; ||wood, forest.] (Zoˆl.) One of the definite areas of the skin of a ||bird on which feathers grow; -- contrasted with apteria.

Pter`y*log"ra*phy (?), n. [Pteryla + -graphy.] (Zoˆl.) The study or description of the arrangement of feathers, or of the pterylÊ, of birds.

||Pter`y*lo"sis (?), n. [NL., fr. NL. & E. pteryla.] (Zoˆl.) The ||arrangement of feathers in definite areas.

Ptil"o*cerque (?), n. [Gr. &?; a feather + &?; tail.] (Zool.) The pentail.

||Ptil`o*pÊ"des (?), n. pl. [NL., fr. Gr. &?; a feather + &?;, &?;, ||offspring.] (Zoˆl.) Same as DasypÊdes.

Ptil`o*pÊd"ic (?), a. (Zoˆl.) Having nearly the whole surface of the skin covered with down; dasypÊdic; -- said of the young of certain birds.

||Pti*lop"te*ri (?), n. pl. [NL., fr. Gr. &?; a downy feather + &?; ||wing.] (Zoˆl.) An order of birds including only the penguins.

||Pti*lo"sis (?), n. [NL., fr. Gr &?; a feather.] (Zoˆl.) Same as ||Pterylosis.

Ptis"an (?), n. [L. ptisana peeled barley, barley water, Gr. &?;, from &?; to peel, husk; cf. F. ptisane, tisane.] 1. A decoction of barley with other ingredients; a farinaceous drink.

2. (Med.) An aqueous medicine, containing little, if any, medicinal agent; a tea or tisane.