Chapter 841

I`so*hy"e*tose` (?) , a. [ Iso- + Gr. "yeto`s rain.] (Phys. Geog.) Of or pertaining to lines connecting places on the earth's surface which have a mean annual rainfall. -- n. An isohyetose line.<-- = isohyet (in MW10) lines with equal rainfall. --> <-- ##sic in original -- should be the *same* mean rainfall? -->

Isolable <Xpage=791>

I"so*la*ble (?) , a. [See Isolate .] (Chem.) Capable of being isolated, or of being obtained in a pure state; as, gold is isolable .

Isolate <Xpage=791>

I"so*late (?; 277) , v. t. [ imp. & p. p. Isolated (?) ; p. pr. & vb. n. Isolating (?) .] [It. isolato , p. p. of isolare to isolate, fr. isola island, L. insula . See 2d Isle , and cf. Insulate .]

1. To place in a detached situation; to place by itself or alone; to insulate; to separate from others.

Short isolated sentences were the mode in which ancient wisdom delighted to convey its precepts. Bp. Warburton.

2. (Elec.) To insulate. See Insulate .

3. (Chem.) To separate from all foreign substances; to make pure; to obtain in a free state.

Isolated <Xpage=791>

I"so*la`ted (?) , a. Placed or standing alone; detached; separated from others.

Isolated point of a curve . (Geom.) See Acnode .

Isolatedly <Xpage=791>

I"so*la`ted*ly (?) , adv. In an isolated manner.

Isolation <Xpage=791>

I`so*la"tion (?) , n. [Cf. F. isolation .] The act of isolating, or the state of being isolated; insulation; separation; loneliness.

Milman.

<page="792"> Page 792

Isolator <Xpage=792>

I"so*la`tor (?) , n. One who, or that which, isolates.

Isologous <Xpage=792>

I*sol"o*gous (?) , a. [ Iso- + Gr. <?/ proportion.] (Chem.) Having similar proportions, similar relations, or similar differences of composition; -- said specifically of groups or series which differ by a constant difference; as, ethane, ethylene, an acetylene, or their analogous compounds, form an isologous series .

Isomer <Xpage=792>

I"so*mer , n. [See Isomeric .] (Chem.) A body or compound which is isomeric with another body or compound; a member of an isomeric series.

Isomeric <Xpage=792>

I`so*mer"ic (?) , a. [ Iso- + Gr. <?/ part: cf. F. isom\'82rique .] (Chem.) Having the same percentage composition; -- said of two or more different substances which contain the same ingredients in the same proportions by weight, often used with with . Specif.: (a) Polymeric; i. e. , having the same elements united in the same proportion by weight, but with different molecular weights; as, acetylene and benzine are isomeric ( polymeric ) with each other in this sense . See Polymeric . (b) Metameric; i. e. , having the same elements united in the same proportions by weight, and with the same molecular weight, but which a different structure or arrangement of the ultimate parts; as, ethyl alcohol and methyl ether are isomeric ( metameric ) with each other in this sense . See Metameric .

Isomeride <Xpage=792>

I*som"er*ide (?) , n. (Chem.) An isomer. [R.]

Isomerism <Xpage=792>

I*som"er*ism (?) , n. (Chem.) The state, quality, or relation, of two or more isomeric substances.

Physical isomerism (Chem.) , the condition or relation of certain ( metameric ) substances, which, while chemically identical (in that they have the same composition, the same molecular weights, and the same ultimate constitution), are yet physically different, as in their action on polarized light, as dextro- and l\'91vo-tartaric acids. In such compounds there is usually at least one unsymmetrical carbon atom. See Unsymmetrical . <-- "metamerism" is no longer used, and "isomerism" is generally applied to this conept. including optical isomerism, the property of optical isomers -->

Isomeromorphism <Xpage=792>

I`so*mer`o*mor"phism (?) , n. [ Isomer + Gr. <?/ form + - ism .] (Crystallog.) Isomorphism between substances that are isomeric.

Isometric, Isometrical <Xpage=792>

I`so*met"ric (?) , I`so*met"ric*al (?) , a. [ Iso- + Gr. <?/ measure.]

1. Pertaining to, or characterized by, equality of measure.

2. (Crystallog.) Noting, or conforming to, that system of crystallization in which the three axes are of equal length and at right angles to each other; monometric; regular; cubic. Cf. Crystallization .

Isometric lines (Thermodynamics) , lines representing in a diagram the relations of pressure and temperature in a gas, when the volume remains constant. -- Isometrical perspective . See under Perspective . -- Isometrical projection , a species of orthographic projection, in which but a single plane of projection is used. It is so named from the fact that the projections of three equal lines, parallel respectively to three rectangular axes, are equal to one another. This kind of projection is principally used in delineating buildings or machinery, in which the principal lines are parallel to three rectangular axes, and the principal planes are parallel to three rectangular planes passing through the three axes.

Isomorph <Xpage=792>

I"so*morph (?) , n. [See Isomorphous .] A substance which is similar to another in crystalline form and composition.

Isomorphic <Xpage=792>

I`so*mor"phic (?) , a. Isomorphous.

Isomorphism <Xpage=792>

I`so*mor"phism (?) , n. [Cf. F. isomorphisme .] (Crystallog.) A similarity of crystalline form between substances of similar composition, as between the sulphates of barium ( BaSO4 ) and strontium ( SrSO4 ). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called hom\'d2omorphism .

<-- (math): see isomorphic -->

Isomorphous <Xpage=792>

I`so*mor"phous (?) , a. [ Iso- + - morphous .] Having the quality of isomorphism.

Isonandra <Xpage=792>

I`so*nan"dra (?) , n. [ Iso- + Gr. <?/, <?/, a man, male.] (Bot.) A genus of sapotaceous trees of India. Isonandra Gutta is the principal source of gutta-percha.

Isonephelic <Xpage=792>

I`so*ne*phel"ic (?) , a. [ Iso- + Gr. <?/ a cloud.] (Phys. Geog.) Having, or indicating, an equal amount of cloudiness for a given period; as, isonephelic regions; an isonephelic line.

Isonicotine <Xpage=792>

I`so*nic"o*tine (?) , n. [ Iso- + nicotine .] (Chem.) A crystalline, nitrogenous base, C10H14N2 , isomeric with nicotine.

Isonicotinic <Xpage=792>

I`so*nic`o*tin"ic (?) , a. (Chem.) (a) Pertaining to, or derived from, isonicotine. (b) Pertaining to, or designating, an acid isomeric with nicotinic acid.

Isonitroso- <Xpage=792>

I`so*ni*tro"so- (?) . [ Iso- + nitroso -.] (Chem.) A combining from (also used adjectively), signifying: Pertaining to, or designating, the characteristic, nitrogenous radical, NOH , called the isonitroso group.

Isonomic <Xpage=792>

I`so*nom"ic (?) , a. [Gr. <?/; <?/ equal + <?/ law.] The same, or equal, in law or right; one in kind or origin; analogous; similar.

Dana.

Isonomy <Xpage=792>

I*son"o*my (?) , n. [Gr. <?/: cf. F. isonomie . See Isonomic .] Equal law or right; equal distribution of rights and privileges; similarity.

Isopathy <Xpage=792>

I*sop"a*thy (?) , n. [ Iso- + Gr. <?/ suffering.] (Med.) (a) The system which undertakes to cure a disease by means of the virus of the same disease. (b) The theory of curing a diseased organ by eating the analogous organ of a healthy animal. Mayne . (c) The doctrine that the power of therapeutics is equal to that of the causes of disease.

Isopepsin <Xpage=792>

I`so*pep"sin (?) , n. [ Iso- + pepsin .] (Physiol. Chem.) Pepsin modified by exposure to a temperature of from 40&deg; to 60&deg; C.

Isoperimetrical <Xpage=792>

I`so*per`i*met"ric*al (?) , a. [Gr. <?/; <?/ equal + <?/ circumference: cf. F. isop\'82rim\'8atre . See Perimeter .] (Geom.) Having equal perimeters of circumferences; as, isoperimetrical figures or bodies .

Isoperimetry <Xpage=792>

I`so*per*im"e*try (?) , n. (Geom.) The science of figures having equal perimeters or boundaries.

Isopiestic <Xpage=792>

I`so*pi*es"tic (?) , a. [ Iso- + Gr. <?/ to press.] (Thermodynamics) Having equal pressure.

Isopiestic lines , lines showing, in a diagram, the relations of temperature and volume, when the elastic force is constant; -- called also isobars .

Isopleura <Xpage=792>

I`so*pleu"ra (?) , n. pl. [NL. See Iso- , and Pleura .] (Zo\'94l.) A subclass of Gastropoda, in which the body is symmetrical, the right and left sides being equal.

&hand; The intestine terminates at the posterior end of the body, and the gills and circulatory and reproductive organs are paired. It includes the chitons ( Polyplacophora ), together with Neomenia and Ch\'91toderma , which are wormlike forms without a shell.

Isopod <Xpage=792>

I"so*pod (?) , a. (Zo\'94l.) Having the legs similar in structure; belonging to the Isopoda. -- n. One of the Isopoda.

Isopoda <Xpage=792>

I*sop"o*da (?) , n. pl. [NL. See Iso- , and -poda .] (Zo\'94l.) An order of sessile-eyed Crustacea, usually having seven pairs of legs, which are all similar in structure.

&hand; The body is usually depressed, with the abdominal segments short, and often consolidated in part. The branchi\'91 are on the abdominal appendages. The group includes the terrestrial pill bugs and sow bugs, with numerous marine forms. See Arthrostrata , Gribble .

Isopodiform <Xpage=792>

I`so*pod"i*form (?) , a. [ Isopod + - form .] (Zo\'94l.) Having the shape of an isopod; -- said of the larv\'91 of certain insects.

Isopodous <Xpage=792>

I*sop"o*dous (?) , a. Same as Isopod .

Isopogonous <Xpage=792>

I`so*pog"o*nous (?) , a. [ Iso- + Gr. <?/ beard.] (Zo\'94l.) Having the two webs equal in breath; -- said of feathers.

Isoprene <Xpage=792>

I"so*prene (?) , n. [Etymol. uncertain.] (Chem.) An oily, volatile hydrocarbon, obtained by the distillation of caoutchouc or guttaipercha. <-- C5H8 -- unsaturated, and used to make synthetic rubber by polymerization. In organic chemistry, viewed conceptually as the building block of the terpene series of hydrocarbons -->

Isopycnic <Xpage=792>

I`so*pyc"nic (?) , a. [ Iso- + Gr. pykno`s dense.] (Physics) Having equal density, as different regions of a medium; passing through points at which the density is equal; as, an isopycnic line or surface .

Isopycnic <Xpage=792>

I`so*pyc"nic , n. (Physics) A line or surface passing through those points in a medium, at which the density is the same.

Isorcin <Xpage=792>

I*sor"cin (?) , n. [ Iso- + orcin .] (Chem.) A crystalline hydrocarbon derivative, metameric with orcin, but produced artificially; -- called also cresorcin .

Isorropic <Xpage=792>

I`sor*rop"ic (?) , a. [Gr. 'iso`rropos in equipoise; 'i`sos equal + "roph` downward inclination or momentum.] Of equal value.

Isorropic line (in a diagram) (Geom.) , the locus of all the points for which a specified function has a constant value.

Newcomb.

Isosceles <Xpage=792>

I*sos"ce*les (?) , a. [L., fr. Gr. <?/; 'i`sos equal + <?/ leg.] (Geom.) Having two legs or sides that are equal; -- said of a triangle.

Isospondyli <Xpage=792>

I`so*spon"dy*li (?) , n. pl. [NL., fr. Gr. 'i`sos equal + <?/, <?/, a vertebra.] (Zo\'94l.) An extensive order of fishes, including the salmons, herrings, and many allied forms.

Isospondylous <Xpage=792>

I`so*spon"dy*lous (?) , a. (Zo\'94l.) Of or pertaining to the Isospondyli; having the anterior vertebr\'91 separate and normal.

Isosporic <Xpage=792>

I`so*spor"ic (?) , a. [ Iso- + Gr. <?/ fruit.] (Bot.) Producing but one kind of spore, as the ferns and Equiseta. Cf. Heterosporic .

Isostemonous <Xpage=792>

I`so*stem"o*nous (?) , a. [ Iso- + Gr. <?/ thread.] (Bot.) Having exactly as many stamens as petals.

Isostemony <Xpage=792>

I`so*stem"o*ny (?) , n. (Bot.) The quality or state of being isostemonous.

Isosulphocyanate <Xpage=792>

I`so*sul`pho*cy"a*nate (?) , n. (Chem.) A salt of isosulphocyanic acid.

Isosulphocyanic <Xpage=792>

I`so*sul`pho*cy*an"ic (?) , a. (Chem.) Pertaining to, or designating, an acid, HNCS , isomeric with sulphocyanic acid.

Isotheral <Xpage=792>

I*soth"er*al (?) , a. Having the nature of an isothere; indicating the distribution of temperature by means of an isothere; as, an isotheral chart or line .

Isothere <Xpage=792>

I"so*there (?) , n. [ Iso- + Gr. <?/ summer, <?/ to heat.] (Phys. Geog.) A line connecting points on the earth's surface having the same mean summer temperature.

Isotherm <Xpage=792>

I"so*therm (?) , n. [ Iso- + Gr. <?/ heat, fr. <?/ hot.] (Phys. Geog.) A line connecting or marking points on the earth's surface having the same temperature. This may be the temperature for a given time of observation, or the mean temperature for a year or other period. Also, a similar line based on the distribution of temperature in the ocean.

Isothermal <Xpage=792>

I`so*ther"mal (?) , a. [Cf. F. isotherme .] (a) Relating to equality of temperature. (b) (Phys. Geog.) Having reference to the geographical distribution of temperature, as exhibited by means of isotherms; as, an isothermal line; an isothermal chart.

Isothermal line . (a) An isotherm . (b) A line drawn on a diagram of energy such that its ordinates represent the pressures of a substance corresponding to various volumes, while the absolute temperature is maintained at a constant value. -- Isothermal zones , spaces on opposite sides of the equator having the same mean temperature, and bounded by corresponding isothermal lines.

Isothermobath <Xpage=792>

I`so*ther"mo*bath (?) , n. [ Iso- + Gr. <?/ hot + <?/ depth.] (Phys. Geog) A line drawn through points of equal temperature in a vertical section of the ocean.

Isothermobathic <Xpage=792>

I`so*ther`mo*bath"ic (?) , a. Of or pertaining to an isothermobath; possessing or indicating equal temperatures in a vertical section, as of the ocean.

Isotherombrose <Xpage=792>

I*soth`er*om"brose (?) , n. [ Iso- + Gr. qe`ros summer + 'o`mbros rain.] (Phys. Geog) A line connecting or marking points on the earth's surface, which have the same mean summer rainfall.

Isotonic <Xpage=792>

I`so*ton"ic (?) , a. [ Iso- + tonic .] Having or indicating, equal tones, or tension.

Isotonic system (Mus.) , a system consisting of intervals, in which each concord is alike tempered, and in which there are twelve equal semitones.

Isotrimorphic <Xpage=792>

I`so*tri*mor"phic (?) , a. Isotrimorphous.

Isotrimorphism <Xpage=792>

I`so*tri*mor"phism (?) , n. [ Iso- + Gr. <?/ thrice + <?/ form.] Isomorphism between the three forms, severally, of two trimorphous substances.

Isotrimorphous <Xpage=792>

I`so*tri*mor"phous (?) , a. Having the quality of isotrimorphism; isotrimorphic.

Isotropic <Xpage=792>

I`so*trop"ic (?) , a. [ Iso- + Gr. <?/ a turning, fr. <?/ to turn.] (Physics) Having the same properties in all directions; specifically, equally elastic in all directions.

Isotropism <Xpage=792>

I*sot"ro*pism (?) , n. Isotropy.

Isotropous <Xpage=792>

I*sot"ro*pous (?) , a. Isotropic.

Isotropy <Xpage=792>

I*sot"ro*py (?) , n. (Physics) Uniformity of physical properties in all directions in a body; absence of all kinds of polarity; specifically, equal elasticity in all directions.

Isouric <Xpage=792>

I`so*u"ric (?) , a. [ Iso- + uric .] (Chem.) Pertaining to, or designating, a complex nitrogenous acid, isomeric with uric acid.

Israelite <Xpage=792>

Is"ra*el*ite (?) , n. [L. Isra\'89lites , Gr. <?/, fr. <?/, <?/, Israel, Heb. Yisr\'be<?/l , i. e., champion of God; s\'ber\'beh to fight + <?/l God.] A descendant of Israel, or Jacob; a Hebrew; a Jew.

Israelitic, Israelitish <Xpage=792>

Is`ra*el*it"ic (?) , Is"ra*el*i`tish (?) , a. Of or pertaining to Israel, or to the Israelites; Jewish; Hebrew.

Issuable <Xpage=792>

Is"su*a*ble (?) , a. [From Issue .]

1. Leading to, producing, or relating to, an issue; capable of being made an issue at law.

Burrill.

2. Lawful or suitable to be issued; as, a writ issuable on these grounds .

Issuable plea (Law) , a plea to the merits, on which the adverse party may take issue and proceed to trial.

Issuably <Xpage=792>

Is"su*a*bly (?) , adv. In an issuable manner; by way of issue; as, to plead issuably .

Issuance <Xpage=792>

Is"su*ance (?) , n. The act of issuing, or giving out; as, the issuance of an order; the issuance of rations, and the like.

Issuant <Xpage=792>

Is"su*ant (?) , a. (Her.) Issuing or coming up; -- a term used to express a charge or bearing rising or coming out of another.

Issue <Xpage=792>

Is"sue (?) , n. [OF. issue , eissue , F. issue , fr. OF. issir , eissir , to go out, L. exire ; ex out of, from + ire to go, akin to Gr. <?/, Skr. i ., Goth. iddja went, used as prefect of gaggan to go. Cf. Ambition , Count a nobleman, Commence , Errant , Exit , Eyre , Initial , Yede went.]

1. The act of passing or flowing out; a moving out from any inclosed place; egress; as, the issue of water from a pipe, of blood from a wound, of air from a bellows, of people from a house .

2. The act of sending out, or causing to go forth; delivery; issuance; as, the issue of an order from a commanding officer; the issue of money from a treasury.

3. That which passes, flows, or is sent out; the whole quantity sent forth or emitted at one time; as, an issue of bank notes; the daily issue of a newspaper.

4. Progeny; a child or children; offspring. In law, sometimes, in a general sense, all persons descended from a common ancestor; all lineal descendants.