Webster's Dictionary, 1913

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Isocrymal adjective (Physics Geology) Pertaining to, having the nature of, or illustrating, an isocryme; as, an isocrymal line; an isocrymal chart.

Isocryme noun [ Iso- + Greek ... cold.] (Physics Geology) A line connecting points on the earth's surface having the same mean temperature in the coldest month of the year.

Isocrymic adjective Isocrymal.

Isocyanic adjective [ Iso- + cyanic .] (Chemistry) Designating an acid isomeric with cyanic acid.

Isocyanic acid , an acid metameric with cyanic acid, and resembling it in its salts. It is obtained as a colorless, mobile, unstable liquid by the heating cyanuric acid. Called technically carbimide .

Isocyanuric adjective [ Iso- + cyanuric .] (Chemistry) Designating, or pertaining to, an acid isomeric with cyanuric acid, and called also fulminuric acid . See under Fulminuric .

Isodiabatic adjective [ Iso- + Greek ... to pass through.] (Physics) Pertaining to the reception or the giving out of equal quantities of heat by a substance. Rankine.

Isodiabatic lines or curves , a pair of lines or curves exhibiting, on a diagram of energy, the law of variation of the pressure and density of a fluid, the one during the lowering, and the other during the raising, of its temperature, when the quantity of heat given out by the fluid during any given stage of the one process is equal to the quantity received during the corresponding stage of the other. Such lines are said to be isodiabatic with respect to each other. Compare Adiabatic .

Isodiametric adjective [ Iso- + diametric .]


1. (Crystallog.) Developed alike in the directions of the several lateral axes; -- said of crystals of both the tetragonal and hexagonal systems.

2. (Botany) Having the several diameters nearly equal; -- said of the cells of ordinary parenchyma.

Isodimorphic adjective [ Iso- + dimorphic .] Isodimorphous.

Isodimorphism noun Isomorphism between the two forms severally of two dimorphous substances.

Isodimorphous adjective [ Iso- + dimorphous .] Having the quality of isodimorphism.

Isodrome noun [ Iso- + Greek ... course.] (Nav.) A method of moving a fleet from one formation to another, the direction usually being changed eight points (90°), by means of paths of equal length for each ship. It is prohibited in the United States navy.

Isodulcite noun [ Iso- + dulcite .] (Chemistry) A white, crystalline, sugarlike substance, obtained by the decomposition of certain glucosides, and intermediate in nature between the hexacid alcohols ( dulcite , mannite , etc.) and the glucoses.

Isodynamic adjective [ Iso- + dynamic .] Of, pertaining to, having, or denoting, equality of force.

Isodynamic foods (Physiol.) , those foods that produce a similar amount of heat. -- Isodynamic lines (Magnetism) , lines on the earth's surface connecting places at which the magnetic intensity is the same.

Isodynamous adjective [ Greek .... See Isodynamic .] Of equal force or size.

Isogeotherm noun [ Iso- + Greek gh^ the earth + qe`rmh heat.] (Physics Geology) A line or curved surface passing beneath the earth's surface through points having the same mean temperature.

Isogeothermal, Isogeothermic adjective Pertaining to, having the nature of, or marking, isogeotherms; as, an isogeothermal line or surface; as isogeothermal chart. -- noun An isogeotherm.

Isogonic adjective [ Iso- + Greek gwni`a angle.] Pertaining to, or noting, equal angles.

Isogonic lines (Magnetism) , lines traced on the surface of the globe, or upon a chart, connecting places at which the deviation of the magnetic needle from the meridian or true north is the same.

Isogonic adjective (Zoology) Characterized by isogonism.

Isogonism noun [ Iso- + Greek ... offspring, generative parts.] (Zoology) The quality of having similar sexual zooids or gonophores and dissimilar hydrants; -- said of certain hydroids.

Isographic adjective Of or pertaining to isography.

Isography noun [ Iso- + -graphy .] Imitation of another's handwriting.

Isohyetose adjective [ Iso- + Greek "yeto`s rain.] (Physics Geology) Of or pertaining to lines connecting places on the earth's surface which have a mean annual rainfall. -- noun An isohyetose line.

Isolable adjective [ See Isolate .] (Chemistry) Capable of being isolated, or of being obtained in a pure state; as, gold is isolable .

Isolate transitive verb [ imperfect & past participle Isolated ; present participle & verbal noun Isolating .] [ Italian isolato , past participle of isolare to isolate, from isola island, Latin insula . See 2d Isle , and confer 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. (Electricity) To insulate. See Insulate .

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

Isolated adjective Placed or standing alone; detached; separated from others.

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

Isolatedly adverb In an isolated manner.

Isolation (-lā"shŭn) noun [ Confer French isolation .] The act of isolating, or the state of being isolated; insulation; separation; loneliness. Milman.

Isolator (ī"so*lā`tẽr or īs"o*lā`tẽr) noun One who, or that which, isolates.

Isologous adjective [ Iso- + Greek lo`gos proportion.] (Chemistry) 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, and acetylene, or their analogous compounds, form an isologous series.

Isomer (ī"so*mẽr) noun [ See Isomeric .] (Chemistry) A body or compound which is isomeric with another body or compound; a member of an isomeric series.

Isomere noun [ Iso- + - mere .] (Zoology)
1. A homologous or corresponding part or segment.

2. (Chemistry) = Isomer .

Isomeric (-mĕr"ĭk) adjective [ Iso- + Greek me`ros part: confer French isomérique .] (Chemistry) 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 with 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 noun (Chemistry) An isomer. [ R.]

Isomerism noun (Chemistry) The state, quality, or relation, of two or more isomeric substances.

Physical isomerism (Chemistry) , 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 lævo-tartaric acids. In such compounds there is usually at least one unsymmetrical carbon atom. See Unsymmetrical .

Isomeromorphism noun [ Isomer + Greek ... form + -ism .] (Crystallog.) Isomorphism between substances that are isomeric.

Isometric, Isometrical adjective [ Iso- + Greek me`tron 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. Confer 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 noun [ See Isomorphous .] A substance which is similar to another in crystalline form and composition.

Isomorph noun (Biol.) An animal, plant, or group having superficial similarity to another, although phylogenetically different.

Isomorphic adjective Isomorphous.

Isomorphic adjective (Biol.) Alike in form; exhibiting isomorphism.

Isomorphism noun [ Confer French isomorphisme .] (Crystallog.) A similarity of crystalline form between substances of similar composition, as between the sulphates of barium (BaSO 4 ) and strontium (SrSO 4 ). It is sometimes extended to include similarity of form between substances of unlike composition, which is more properly called homœomorphism .

Isomorphous adjective [ Iso- + -morphous .] Having the quality of isomorphism.

Isonandra noun [ Iso- + Greek ..., ..., a man, male.] (Botany) A genus of sapotaceous trees of India. Isonandra Gutta is the principal source of gutta-percha.

Isonephelic adjective [ Iso- + Greek ... a cloud.] (Physics Geology) Having, or indicating, an equal amount of cloudiness for a given period; as, isonephelic regions; an isonephelic line.

Isonicotine noun [ Iso- + nicotine .] (Chemistry) A crystalline, nitrogenous base, C 10 H 14 N 2 , isomeric with nicotine.

Isonicotinic adjective (Chemistry) (a) Pertaining to, or derived from, isonicotine. (b) Pertaining to, or designating, an acid isomeric with nicotinic acid.

Isonitroso- [ Iso- + nitroso -.] (Chemistry) A combining form (also used adjectively), signifying: Pertaining to, or designating, the characteristic, nitrogenous radical, NOH, called the isonitroso group.

Isonomic adjective [ Greek ...; ... equal + no`mos law.] The same, or equal, in law or right; one in kind or origin; analogous; similar. Dana.

Isonomy noun [ Greek ...: confer French isonomie . See Isonomic .] Equal law or right; equal distribution of rights and privileges; similarity.

Isopathy noun [ Iso- + Greek ... suffering.] (Medicine) (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.