Chapter 725

Hem`a*to"sin (?) , n. (Physiol. Chem.) The hematin of blood. [R.]

Hematosis <Xpage=684>

Hem`a*to"sis (?) , n. [NL., fr. Gr. a"ima`twsis .] (Physiol.) (a) Sanguification; the conversion of chyle into blood. (b) The arterialization of the blood in the lungs; the formation of blood in general; h\'91matogenesis.

Hematotherma <Xpage=684>

Hem`a*to*ther"ma (?) , n. pl. [NL., from Gr. a"i^ma , a"i`matos , blood + thermo`s warm.] (Zo\'94l.) The warm-blooded vertebrates, comprising the mammals and birds; -- the antithesis to hematocrya .

Hematothermal <Xpage=684>

Hem"a*to*ther"mal (?) , a. Warm-blooded.

Hematoxylin <Xpage=684>

Hem`a*tox"y*lin (?) , n. H\'91matoxylin.

Hematuria <Xpage=684>

Hem`a*tu"ri*a (?) , n. [NL. See Hema- , and Urine .] (Med.) Passage of urine mingled with blood.

Hemautography <Xpage=684>

Hem`au*tog"ra*phy (?) , n. (Physiol.) The obtaining of a curve similar to a pulse curve or sphygmogram by allowing the blood from a divided artery to strike against a piece of paper.

Hemelytron &or;, Hemelytrum <Xpage=684>

Hem*el"y*tron (? &or; ?) , Hem*el"y*trum (-tr&ucr;m cf. Elytron , 277) , , n. ; pl. Hemelytra (<?/) . [NL. See Hemi , and Elytron .] (Zo\'94l.) One of the partially thickened anterior wings of certain insects, as of many Hemiptera, the earwigs, etc.

Hemeralopia <Xpage=684>

Hem`e*ra*lo"pi*a (?) , n. [NL., fr. Gr. <?/, the opposite of <?/; <?/ day + <?/ of <?/. See Nyctalopia .] (Med.) A disease of the eyes, in consequence of which a person can see clearly or without pain only by daylight or a strong artificial light; day sight.

&hand; Some writers (as Quain) use the word in the opposite sense, i. e. , day blindness. See Nyctalopia .

Hemerobian <Xpage=684>

Hem`er*o"bi*an (?) , n. [Gr. <?/ day + <?/ life.] (Zo\'94l.) A neuropterous insect of the genus Hemerobius , and allied genera.

Hemerobid <Xpage=684>

He*mer"o*bid (?) , a. (Zo\'94l.) Of relating to the hemerobians.

Hemerocallis <Xpage=684>

Hem`e*ro*cal"lis (?) , n. [NL., fr. Gr. <?/; <?/ day + <?/ beauty.] (Bot.) A genus of plants, some species of which are cultivated for their beautiful flowers; day lily.

Hemi- <Xpage=684>

Hem"i- (?) . [Gr. "hmi- . See Semi- .] A prefix signifying half .

Hemialbumin <Xpage=684>

Hem`i*al*bu"min (?) , n. [ Hemi- + albumin .] (Physiol. Chem.) Same as Hemialbumose .

Hemialbumose <Xpage=684>

Hem`i*al"bu"mose` (?) , n. [ Hemi- + albumose .] (Physiol. Chem.) An albuminous substance formed in gastric digestion, and by the action of boiling dilute acids on albumin. It is readily convertible into hemipeptone. Called also hemialbumin .

Hemian\'91sthesia <Xpage=684>

Hem`i*an`\'91s*the"si*a (?) , n. [ Hemi- + an\'91sthesia .] (Med.) An\'91sthesia upon one side of the body.

Hemibranchi <Xpage=684>

Hem`i*bran"chi (?) , n. pl. [NL. See Hemi- , and Branchia .] (Zo\'94l.) An order of fishes having an incomplete or reduced branchial apparatus. It includes the sticklebacks, the flutemouths, and Fistularia.

Hemicardia <Xpage=684>

Hem`i*car"di*a (?) , n. [NL. See Hemi- , and Cardia .] (Anat.) A lateral half of the heart, either the right or left.

B. G. Wilder.

Hemicarp <Xpage=684>

Hem`i*carp (?) , n. [ Hemi- + Gr. <?/ fruit.] (Bot.) One portion of a fruit that spontaneously divides into halves.

Hemicerebrum <Xpage=684>

Hem`i*cer"e*brum (?) , n. [ Hemi- + cerebrum .] (Anat.) A lateral half of the cerebrum.

Wilder.

Hemicollin <Xpage=684>

Hem`i*col"lin (?) , n. [ Hemi- + collin .] (Physiol. Chem.) See Semiglutin .

Hemicrania <Xpage=684>

Hem`i*cra"ni*a (?) , n. [L.: cf. F. h\'82micr\'83nie . See Cranium , and Megrim .] (Med.) A pain that affects only one side of the head.

Hemicrany <Xpage=684>

Hem"i*cra`ny (?) , n. (Med.) Hemicranis.

Hemicycle <Xpage=684>

Hem"i*cy`cle (?) , n. [L. hemicyclus , Gr. <?/; <?/ + <?/.] 1. A half circle; a semicircle.

<page="685"> Page 685

2. A semicircular place, as a semicircular arena, or room, or part of a room.

The collections will be displayed in the hemicycle of the central pavilion. London Academy.

Hemidactyl <Xpage=685>

Hem`i*dac"tyl (?) , n. [See Hemi- , and Dactyl .] (Zo\'94l.) Any species of Old World geckoes of the genus Hemidactylus . The hemidactyls have dilated toes, with two rows of plates beneath.

Hemi-demi-semiquaver <Xpage=685>

Hem`i-dem`i-sem"i*quaver (?) , n. [ Hemi- + demi-semiquaver .] (Mus.) A short note, equal to one fourth of a semiquaver, or the sixty-fourth part of a whole note.

Hemiditone <Xpage=685>

Hem`i*di"tone (?) , n. [ Hemi- + ditone .] (Gr. Mus.) The lesser third.

Busby.

Hemigamous <Xpage=685>

He*mig"a*mous (?) , a. [ Hemi- + Gr. <?/ marriage.] (Bot.) Having one of the two florets in the same spikelet neuter, and the other unisexual, whether male or female; -- said of grasses.

Hemiglyph <Xpage=685>

Hem"i*glyph (?) , n. [ Hemi- + Gr. <?/ a carving.] (Arch.) The half channel or groove in the edge of the triglyph in the Doric order.

Hemihedral <Xpage=685>

Hem`i*he"dral (?) , a. [ Hemi- + Gr. <?/ seat, base, fr. <?/ to sit.] (Crystallog.) Having half of the similar parts of a crystals, instead of all; consisting of half the planes which full symmetry would require, as when a cube has planes only on half of its eight solid angles, or one plane out of a pair on each of its edges; or as in the case of a tetrahedron, which is hemihedral to an octahedron, it being contained under four of the planes of an octahedron. -- Hem`i*he"dral*ly , adv.

Hemihedrism <Xpage=685>

Hem`i*he"drism (?) , n. (Crystallog.) The property of crystallizing hemihedrally.

Hemihedron <Xpage=685>

Hem`i*he"dron (?) , n. (Crystallog.) A solid hemihedrally derived. The tetrahedron is a hemihedron .

Hemiholohedral <Xpage=685>

Hem`i*hol`o*he"dral (?) , a. [ Hemi- + holohedral .] (Crystallog.) Presenting hemihedral forms, in which half the sectants have the full number of planes.

Hemimellitic <Xpage=685>

Hem`i*mel*lit"ic (?) , a. [ Hemi- + mellitic .] (Chem.) Having half as many ( three ) carboxyl radicals as mellitic acid; -- said of an organic acid.

Hemimetabola <Xpage=685>

Hem`i*me*tab"o*la (?) , n. pl. [NL. See Hemi- , and Metabola .] (Zo\'94l.) Those insects which have an incomplete metamorphosis.

Hemimetabolic <Xpage=685>

Hem`i*met`a*bol"ic (?) , a. (Zo\'94l.) Having an incomplete metamorphosis, the larv\'91 differing from the adults chiefly in laking wings, as in the grasshoppers and cockroaches.

Hemimorphic <Xpage=685>

Hem`i*mor"phic (?) , a. [ Hemi- + Gr. <?/ form.] (Crystallog.) Having the two ends modified with unlike planes; -- said of a crystal.

Hemin <Xpage=685>

He"min (?) , n. [Gr. <?/ blood.] (Physiol. Chem.) A substance, in the form of reddish brown, microscopic, prismatic crystals, formed from dried blood by the action of strong acetic acid and common salt; -- called also Teichmann's crystals. Chemically, it is a hydrochloride of hematin.

&hand; The obtaining of these small crystals, from old blood clots or suspected blood stains, constitutes one of the best evidences of the presence of blood.

Hemina <Xpage=685>

He*mi"na (?) , n. ; pl. Hemin\'91 (#) . [L., fr. Gr. <?/.] 1. (Rom. Antiq.) A measure of half a sextary.

Arbuthnot.

2. (Med.) A measure equal to about ten fluid ounces.

Hemionus <Xpage=685>

He*mi"o*nus (?) , n. [NL., fr. Gr. <?/ a half ass, a mule.] (Zo\'94l.) A wild ass found in Thibet; the kiang.

Darwin.

Hemiopia, Hemiopsia <Xpage=685>

Hem`i*o"pi*a (?) , Hem`i*op"si*a (?) , n. [NL., fr. Gr. <?/ half + Gr. <?/ sight.] (Med.) A defect of vision in consequence of which a person sees but half of an object looked at.

Hemiorthotype <Xpage=685>

Hem`i*or"tho*type (?) , a. [ Hemi- + Gr. <?/ straight + -type .] Same as Monoclinic .

Hemipeptone <Xpage=685>

Hem`i*pep"tone (?) , n. [ Hemi- + peptone .] (Physiol. Chem.) A product of the gastric and pancreatic digestion of albuminous matter.

&hand; Unlike antipeptone it is convertible into leucin and tyrosin, by the continued action of pancreatic juice. See Peptone . It is also formed from hemialbumose and albumin by the action of boiling dilute sulphuric acid.

Hemiplegia <Xpage=685>

Hem`i*ple"gi*a (?) , n. [NL., fr. Gr. <?/; <?/ half + <?/ a stroke; cf. F. h\'82miplagie .] (Med.) A palsy that affects one side only of the body. -- Hem`i"pleg"ic (#) , a.

Hemiplegy <Xpage=685>

Hem"i*ple`gy (?) , n. (Med.) Hemiplegia.

Hemipode <Xpage=685>

Hem"i*pode (?) , n. [ Hemi- + Gr. <?/, <?/, foot.] (Zo\'94l.) Any bird of the genus Turnix . Various species inhabit Asia, Africa, and Australia.

Hemiprotein <Xpage=685>

Hem`i*pro"te*in (?) , n. [ Hemi- + protein .] (Physiol. Chem.) An insoluble, proteid substance, described by Sch\'81tzenberger, formed when albumin is heated for some time with dilute sulphuric acid. It is apparently identical with antialbumid and dyspeptone.

Hemipter <Xpage=685>

He*mip"ter (?) , n. [Cf. F. h\'82mipt\'8ares , pl.] (Zo\'94l.) One of the Hemiptera.

Hemiptera <Xpage=685>

He*mip"te*ra (?) , n. pl. [NL., fr. Gr. <?/ half + <?/ wing, fr. <?/ to fly.] (Zo\'94l.) An order of hexapod insects having a jointed proboscis, including four sharp stylets (mandibles and maxill\'91), for piercing. In many of the species (Heteroptera) the front wings are partially coriaceous, and different from the others.

&hand; They are divided into the Heteroptera , including the squash bug, soldier bug, bedbug, etc.; the Homoptera , including the cicadas, cuckoo spits, plant lice, scale insects, etc.; the Thysanoptera , including the thrips, and, according to most recent writers, the Pediculina or true lice.

Hemipteral, Hemipterous <Xpage=685>

He*mip"ter*al (?) , He*mip"ter*ous (?) , a. (Zo\'94l.) Of or pertaining to the Hemiptera.

Hemipteran <Xpage=685>

He*mip"ter*an (?) , n. (Zo\'94l.) One of the Hemiptera; an hemipter.

Hemisect <Xpage=685>

Hem`i*sect" (?) , v. t. [ imp. & p. p. Hemisected ; p. pr. & vb. n. Hemisecting .] [ Hemi- + L. secare to cut.] (Anat.) To divide along the mesial plane.

Hemisection <Xpage=685>

Hem`i*sec"tion (?) , n. (Anat.) A division along the mesial plane; also, one of the parts so divided.

Hemisphere <Xpage=685>

Hem"i*sphere (?) , n. [L. hemisphaerium , Gr. <?/; <?/ half = <?/ sphere: cf. F. h\'82misph\'8are . See Hemi- , and Sphere .] 1. A half sphere; one half of a sphere or globe, when divided by a plane passing through its center.

2. Half of the terrestrial globe, or a projection of the same in a map or picture.

3. The people who inhabit a hemisphere.

He died . . . mourned by a hemisphere . J. P. Peters. ten

Cerebral hemispheres . (Anat.) See Brain . -- Magdeburg hemispheres (Physics) , two hemispherical cups forming, when placed together, a cavity from which the air can be withdrawn by an air pump; -- used to illustrate the pressure of the air. So called because invented by Otto von Guericke at Magdeburg .

Hemispheric, Hemispherical <Xpage=685>

Hem`i*spher"ic (?) , Hem`i*spher"ic*al (?) , a. [Cf. F. h\'82misph\'82rique .] Containing, or pertaining to, a hemisphere; as, a hemispheric figure or form; a hemispherical body.

Hemispheroid <Xpage=685>

Hem`i*sphe"roid (?) , n. [ Hemi- + spheroid .] A half of a spheroid.

Hemispheroidal <Xpage=685>

Hem`i*sphe*roid"al (?) , a. Resembling, or approximating to, a hemisphere in form.

Hemispherule <Xpage=685>

Hem`i*spher"ule (?) , n. A half spherule.

Hemistich <Xpage=685>

Hem"i*stich (?; 277) , n. [L. hemistichium , Gr. "hmisti`chion ; "hmi- half + sti`chos row, line, verse: cf. F. h\'82mistiche .] Half a poetic verse or line, or a verse or line not completed.

Hemistichal <Xpage=685>

He*mis"ti*chal (?) , a. Pertaining to, or written in, hemistichs; also, by, or according to, hemistichs; as, a hemistichal division of a verse .

Hemisystole <Xpage=685>

Hem`i*sys"to*le (?) , n. (Physiol.) Contraction of only one ventricle of the heart.

&hand; Hemisystole is noticed in rare cases of insufficiency of the mitral valve, in which both ventricles at times contract simultaneously, as in a normal heart, this condition alternating with contraction of the right ventricle alone; hence, intermittent hemisystole .

Hemitone <Xpage=685>

Hem"i*tone (?) , n. [L. hemitonium , Gr. <?/.] See Semitone .

Hemitropal, Hemitropous <Xpage=685>

He*mit"ro*pal (?) , He*mit"ro*pous (?) , a. [See Hemitrope .] 1. Turned half round; half inverted.

2. (Bot.) Having the raphe terminating about half way between the chalaza and the orifice; amphitropous; -- said of an ovule.

Gray.

Hemitrope <Xpage=685>

Hem"i*trope (?) , a. [ Hemi- + Gr. <?/ to turn: cf. F. h\'82mitrope .] Half turned round; half inverted; (Crystallog.) having a twinned structure.

Hemitrope <Xpage=685>

Hem"i*trope , n. That which is hemitropal in construction; (Crystallog.) a twin crystal having a hemitropal structure.

Hemitropy <Xpage=685>

He*mit"ro*py (?) , n. (Crystallog.) Twin composition in crystals.

Hemlock <Xpage=685>

Hem"lock (?) , n. [OE. hemeluc , humloc , AS. hemlic , hymlic .] 1. (Bot.) The name of several poisonous umbelliferous herbs having finely cut leaves and small white flowers, as the Cicuta maculata , bulbifera , and virosa , and the Conium maculatum . See Conium .

&hand; The potion of hemlock administered to Socrates is by some thought to have been a decoction of Cicuta virosa , or water hemlock , by others, of Conium maculatum .

2. (Bot.) An evergreen tree common in North America ( Abies, &or; Tsuga, Canadensis ); hemlock spruce.

The murmuring pines and the hemlocks . Longfellow.

3. The wood or timber of the hemlock tree.

Ground hemlock , &or; Dwarf hemlock . See under Ground .

Hemmel <Xpage=685>

Hem"mel (?) , n. [Scot. hemmel , hammel , Prov. E. hemble hovel, stable, shed, perh. allied to D. hemel heaven, canopy, G. himmel ; cf. E. heaven . <?/<?/<?/.] A shed or hovel for cattle. [Prov. Eng.]

Wright.

Hemmer <Xpage=685>

Hem"mer (?) , n. One who, or that which, hems with a needle . Specifically: (a) An attachment to a sewing machine, for turning under the edge of a piece of fabric, preparatory to stitching it down . (b) A tool for turning over the edge of sheet metal to make a hem.

Hemo- <Xpage=685>

Hem"o- (?) . Same as H\'91ma- , H\'91mo- .

Hemoglobin <Xpage=685>

Hem"o*glo"bin (?) , n. [ Hemo- + globe .] (Physiol.) The normal coloring matter of the red blood corpuscles of vertebrate animals. It is composed of hematin and globulin, and is also called h\'91matoglobulin . In arterial blood, it is always combined with oxygen, and is then called oxyhemoglobin . It crystallizes under different forms from different animals, and when crystallized, is called h\'91matocrystallin . See Blood crystal , under Blood .

Hemoglobinometer <Xpage=685>

Hem`o*glo"bin*om"e*ter (?) , n. (Physiol. Chem.) Same as H\'91mochromometer .

Hemophilia <Xpage=685>

Hem`o*phil"i*a (?) , n. See Hematophilia .

Hemoptysis <Xpage=685>

He*mop"ty*sis (?) , n. [NL., fr. Gr. <?/ blood + <?/ to spit: cf. F. h\'82moptysie .] (Med.) The expectoration of blood, due usually to hemorrhage from the mucous membrane of the lungs.

Hemorrhage <Xpage=685>

Hem"or*rhage (?) , n. [L. haemorrhagia , Gr. <?/; <?/ blood + <?/ to break, burst: cf. F. h\'82morriage , h\'82morrhagie .] (Med.) Any discharge of blood from the blood vessels.

&hand; The blood circulates in a system of closed tubes, the rupture of which gives rise to hemorrhage.

Hemorrhagic <Xpage=685>

Hem`or*rhag"ic (?) , a. [Gr. <?/: cf. F. h\'82morrhagique .] Pertaining or tending to a flux o<?/ blood; consisting in, or accompanied by, hemorrhage.

Hemorrhoidal <Xpage=685>

Hem`or*rhoid"al (?) , a. [Cf. F. h\'82morro\'8bdal , h\'82morrho\'8bdal .] 1. Of or pertaining to, or of the nature of, hemorrhoids.

2. (Anat.) Of or pertaining to the rectum; rectal; as, the hemorrhoidal arteries, veins, and nerves .

Hemorrhoids <Xpage=685>

Hem"or*rhoids (?) , n. pl. [L. haemorrhoidae , pl., Gr. <?/, sing., <?/ (sc. <?/), pl., veins liable to discharge blood, hemorrhoids, fr. <?/ flowing with blood; <?/ blood + <?/ to flow: cf. F. h\'82morro\'8bdes , h\'82morrho\'8bdes . See Rheum .] (Med.) Livid and painful swellings formed by the dilation of the blood vessels around the margin of, or within, the anus, from which blood or mucus is occasionally discharged; piles; emerods. [The sing. hemorrhoid is rarely used.]

Hemostatic <Xpage=685>

Hem`o*stat"ic (?) , a. [ Hemo- + Gr. <?/ causing to stand, fr. <?/ to stand.] ets>

1. (Med.) Of or relating to stagnation of the blood.

2. Serving to arrest hemorrhage; styptic.

Hemostatic <Xpage=685>