

ISODYNAMOUS 



Isodynamous (i-so-di'-nam-us) [iooc, equal ; diva/tig, 

 power, force]. Same as /sobrious. 



Iso-electric {i-so-e-lek' -trie) [ioog, equal; ijteicrpov, 

 amber] . Equally electric ; applied to two bodies 

 or points. I. Curves. See Tension-curves. I. 

 Surfaces. See Tension-planes. 



Isogamous (i-sog / -am-us) [law;, equal ; yauog, mar- 

 riage]. A term used to designate that mode of repro- 

 duction in which the uniting gametes are of equal 

 size. The same as conjugating. 



Isogamy isog'-am-e) [iooc, equal ; yauog, marriage]. 

 In biology, conjugation of similar gametes. 



Isogeny (i-soj' -en-e) [ioog, equal ; yivog, kind]. In 

 biology, having a general similarity of origin. 



Isognathous (i-sog* -na-thus) [iooc, equal ; yvadog, jaw]. 

 In biology, having the molar teeth of both jaws alike. 



Isogonic (i-so-gon' -ik) [ioog, equal ; y6rog, offspring]. 

 In biology, characterized by isogonism. 



Isogonism [i-sog' -o-nizm) [ioog, equal ; yovoc, off- 

 spring]. In biology, the production by different stocks 

 of sexual organisms of identical structure. 



Isogynous (i-so/'-in-us) [Iooc, equal; ywrj, female]. 

 In biology, having the pistils or carpels equal in 

 number to the sepals. 



Isolate (is'-so-ldt or i'-so-laf) [isola, an island]. To 

 separate one from another. To place apart. In 

 chemistry, to separate an element from its combina- 

 tion. In electricity, to insulate. 



Isolation is-o-la' -shun) [isola, an island]. The act 

 or process of isolating, or the state of being isolated ; 

 separation of those ill of contagious diseases from 

 other persons. 



Isologous (i-sol'-o-gus) [iooc, equal ; "fjbyoc, method, 

 ratio, or system]. Having similar relations or pro- 

 portions. A qualification applied to compounds con- 

 taining a like number of carbon-atoms, with a gradually 

 decreasing number of hydrogen-atoms. 



Isolophobia (is-o-lo-fo 1 -be-ah) [isola, an island ; <p6{3og, 

 fear] . Morbid dread of being alone. 



Isomastigate (i-so-mas' -tig-ai) [iooc, equal ; udori^, a 

 whip]. In biology, applied to organisms bearing two 

 or more similar flagella. 



Isomer i'-som-er) [ioouepqg, having equal parts]. An 

 isomeric body. The same as Isomerid. 



Isomere (i'-so-mer) [ioofiepifc, having equal parts]. In 

 biology, a portion of one organism that is homologous 

 with a portion of another organism . 

 Isomeric i-so-mer / -ik) [iooc, equal ; fiipog, a part]. In 



i chemistry, applied to substances having the same cen- 

 tesimal composition, but the molecules of which have 

 an essentially different structure and chemic properties ; 

 e. g. , aldehyd and ethylene oxid, both of which have 

 the formula C,H 4 0. The former, however, has the 

 structure — 



Methyl. Carbonic 

 oxid. 

 CH 3 — CO — H, 



ile the latter is composed of two molecules of 

 tiylene, joined by an atom of oxygen, thus (CH 2 ) — 

 -(CHj). This, the most common type of isomer- 

 is sometimes called metamerism. The term is also 

 plied to substances having the same centesimal com- 

 sition, but whose molecular weights are in even 

 multiples, a type of isomerism commonly called poly- 

 mertsm. Also, in crystallography, applied to any sub- 

 stance that crystallizes in more than one form. Also, 

 applied to a substance existing in two or more 

 forms, a type of isomerism called allotropism. I. 

 Theory of Nerve-force ; Herbert Spencer's 

 hypothesis that in nervous action the disturbance 

 itted is a wave of isomeric change, the alter- 





629 ISOPHORIA 



nation of isomeric states depending upon both nerve- 

 fiber and molecular continuity. 



Isomerids (i-som' -er-ids) [ioouepfc, consisting of equal 

 parts: iooc, equal ; uipoc, a part]. A name applied 

 to different substances possessing the same molecular 

 composition. I., Physical, a designation applied to 

 derivations to which one and the same structural 

 formula must be assigned. They have been explained 

 by assuming them to be different aggregations of mole- 

 cules that were chemically similar. See also Physi- 

 cal Molecules. 



Isomerism (i-som* -er-izm) [iooc, equal ; uipoc, a part]. 

 The phenomenon of bodies of like composition and 

 like number of atoms being different in physical or 

 in chemic properties, or in both. I., Geometric. 

 Alloisomerism, q.v. I., Spatial. Same as I., Geo- 

 metric. 



Isomerous {i-som' -er-us) [iooc, equal ; uipog, part, 

 share]. In biology, having an equal number of parts, 

 ridges, or markings. 



Isometric (i- so-met' -rik) [iooc, equal ; ptrpov, measure]. 

 Of equal measure. I. Act, the tension of a muscle 

 when stimulated, its length remaining constant. 



Isometropia (i-so-met-ro'-pe-ah) [iooc, equal; pkrpov, 

 measure ; uty, eve ]- Equality of kind and degree in 

 tne refraction of the two eyes. 



Isomorph (i'-so-morf) [iooc, equal ; uoppr,, form]. In 

 biology, one of two similar organisms belonging to 

 different groups. 



Isomorphic (i-so-mor'-Jik) [iooc, equal; fiopor/, form]. 

 In biology, pertaining to morphologic similarity. 



Isomorphism {i-so-mor 1 '-fizm) [iooc, equal ; uoptbij, 

 form]. Similarity in crystalline form. Also, the replace- 

 ment of one element in a crystalline salt by another, 

 without alteration of form or system. I., Heteromer- 

 ous, a condition of dissimilarity in molecular composi- 

 tion. I., Isomerous, a condition of similarity in 

 molecular composition. I., Polymeric, the substitu- 

 tion of two or more atoms of one element for one of 

 another, without alteration of crystalline form. 



Isonitrosoacetones (i-so-ni-tro-so-as' -et-onz). A group 

 of colorless crystalline bodies, readily soluble in ether 

 and in chloroform, and as a rule soluble with difficulty 

 in alcohol. Their alkaline solutions have an intensely 

 yellow color. 



Isonitroso-compounds (i-so-ni-tr& '-so-kom' '-pewndz). 

 Compounds that contain the bivalent oximid group 

 =N.OH linked to carbon. 



Isonomic (i-so-nom' -ik) [ioovofuxbg, having equality of 

 laws]. In chemistry, applied to isomorphism ex- 

 isting between two compounds of like composition. 



Isonym (i'-so-nim) [iooc, equal; bvoua, a name]. A 

 paronym. 



Isopathotherapy (i-so-path-o-ther* '-ap-e). Same as Iso- 

 pathy. 



Isopathy (i-sop J -athe) [iooc, equal ; itadoc, suffering]. 

 A term used to denote the treatment of disease by 

 the administration of one or more of its own products. 

 Thus, smallpox would be treated by the administra- 

 tion internally of the variolous excretions. 



Isopelletierin (i-so-pel-ef -e-er-in) [iooc, equal ; pelle- 

 tierin\ . A substance found in the root-bark of Tunica 

 granatum. It has the same properties as pelletierin. 



Isopepsin (i-so-pep / -sin) [iooc, equal ; ~iypic, digestion]. 

 I. A body formed by heating pepsin to a point be- 

 tween 104 and 140 F. It changes albumin into 

 parapeptone. 2. Same as Parapeptone. 



Isopetalous (i-so-pet'-al-us) [iooc, equal ; Treras.ov, a 

 leaf]. In biology, having the .petals alike. 



Isophoria (i-so-ftZ-re-ah) [iooc, equal ; oopoc, a tending]. 

 A condition in which the eyes lie in the same hori- 

 zontal plane, the tension of the vertical muscles of 



