ISO- 



158 



JAC- 



the flagella of equal length 

 (zool.). 



isomere (I'somer) n. [Gk. isos, equal; 

 meros, part.] A homologous struc- 

 ture or part (zool.). 



isoinerous (Isom'Srus) a. [Gk. isos, 

 equal; meros, part.] Having equal 

 numbers of different parts ; appl. 

 flowers with the same number of 

 parts in each whorl (dot.). 



isomorphic (I'somor'fik) a. [Gk. isos, 

 equal ; morphe, shape.] Super- 

 ficially alike (biol.\ 



Isomorphism (I'somor'fizm) n. [Gk. 

 tsos, equal ; morphe, shape.] Ap- 

 parent similarity of individuals of 

 different race or species (diol.). 



isomorphous (I'somor'fus) a. Isomor- 

 phic. 



isopedine (isop'edin) n. [Gk. isopedos, 

 level.] A layer of compact bony 

 material in certain fish scales (zool.). 



isopetalous (I'sopeYalus) a. [Gk. isos, 

 equal ; petalon, petal.] Having 

 similar petals (dot.). 



isophytoid (I'sofi'toid) a. [Gk. isos, 

 equal ; phyton, plant.] An " indi- 

 vidual" or part of a compound 

 plant not differentiated from the 

 rest (dot.). 



isopodous (Isop'odus) a. [Gk. isos t 

 equal ; pous, foot.] Having the 

 legs alike and equal (zool.). 



Isopogonous (I'sopog'onus) a. [Gk. 

 isos, equal ; pogon, beard.] Of 

 feathers having the two webs 

 equal and similar (zool.). 



isospore (I'sospor 7 ) n. [Gk. isos, equal ; 

 sporos, seed.] An agamete pro- 

 duced by schizogony ; opp. aniso- 

 spore (zool., hot.). 



isosporous (Isos'porus) a. [Gk. isos, 

 equal ; sporos, seed.] Having 

 spores of one kind only (hot.). 



isostemonous (I'sostgm'onus) a. [Gk. 

 isos, equal ; L. stamen, standing.] 

 Having stamens equal in number 

 to that of sepals and petals (dot.). 



isotely (Tsot'glT) n. [Gk. isos, equal ; 

 telos, end.] The close resemblance 

 in a homologous character, feature, 

 or organ which has undergone 

 subsequent modifications on a 

 similar line although it may be in 

 widely divergent groups (zool., dot.). 



isotomy (Ts6t'6mT) n. [Gk. tsos, 

 equal ; temnein, to cut.] Bifurca- 



tion constantly repeated in a 

 regular manner, as in crinoid 

 brachia (zool.). 



isotonic (I'soton'ik) a. [Gk. isos, 

 equal ; tonos, tone.] Of equal 

 tension (phys.). 



isotonicity (I'sotonis'iti) n. [Gk. isos, 

 equal ; tonos, tone.] Normal ten- 

 sion under pressure or stimulus 

 (phys.). 



isotropous (isot'ropiis) a. [Gk. isos, 

 equal ; trepein, to turn.] Not 

 influenced in any one direction 

 more than another (dot.) ; without 

 predetermined axes, as in eggs 

 (zool.). 



isotropy (isot'ropi) n. [Gk. isos, 

 equal ; trepein, to turn.] Absence 

 of predetermined axes in eggs. 

 (emd.). 



isozoic (I'sozo'ik) a. [Gk. isos, equal ; 

 zoon, animal.] Inhabited by 

 similar forms of animal life (dial ). 



isozooid (I'sozo'oid) n. [Gk. isos, 

 equal ; zoon, animal ; eidos, like.] 

 A zooid similar to the parent 

 stock (zoo!.). 



isthmiate (is'miat) a. [Gk. isthmos, 

 neck.] Connected by an isthmus- 

 like part. 



isthmus (is'mus) n. [Gk. isthmos, 

 neck.] A narrow structure con- 

 necting two larger parts, as those 

 of aorta, acoustic meatus, limbic 

 lobe, thyroid, etc. (anat.). 



iter (ft'Sr) n. [L. iter, way.] A 

 passage or canal, as those of the 

 middle ear, brain, etc. ; an aque- 

 duct (anat.). 



ivory (I'vori) n. [L. edur, ivory, 

 through French.] Dentine of teeth, 

 usually that of the elephant's tusks 

 and similar structures, formed from 

 the odontoblasts. 



Jacobson's cartilage, a special carti- 

 lage formed in the nose region, 

 supporting Jacobson's organ. 



Jacobson's organ, a diverticulum of 

 the olfactory organ in many verte- 

 brates, often developing into an 

 epithelium-lined sac which opens 

 into the mouth. 



