DIA- 



DIC- 



through ; arthroun, to fasten by a 

 joint.] An articulation allowing 

 considerable movement (anat.}. 



diastase (dl'astas) n. [Gk. dia, 

 through ; histanai, to set.] An 

 enzyme which acts principally in 

 converting starch into sugar 

 (phys.\ 



diastatic (dl'astat'lk) a. [Gk. diet, 

 through ; histanai, to set.] Pert. 

 diastase, or having similar prop- 

 erties (phys.}. 



diastema (dlas'tgrnS, dl'aste'ma) n. 

 [Gk. diastema) space.] A space in 

 a jaw without teeth, usually be- 

 tween two types of teeth (zool.}. 



diaster (dlas'ter) n. [Gk. dis, twice ; 

 aster, star.] The stage in mitosis 

 where the daughter chromosomes 

 are grouped near the spindle poles 

 ready to form a new nucleus (cyt.}. 



diastole (dlas'tole) n. [Gk. diastole, 

 difference.] The rhythmical relaxa- 

 tion of the heart ; the rhythmical 

 expansion of a contractile vacuole 

 (zool.\ 



diastomatic (dl'astom&t'Ik) a. [Gk. 

 dia, through; stoma, pore.] Through 

 the stomata or pores, giving off 

 gases from the spongy parenchyma 

 through the stomata (bot.}. 



diathesis (diathesis) n. [Gk. dia, 

 through ; tithenai, to place.] A 

 congenital predisposition to some 

 class of diseases or type of develop- 

 ment (biol.}. 



diatom (dl'atom) n. [Gk. dia, through ; 

 temnein, to cut.] Any unicellular 

 microscopic form of Alga with walls 

 of silica (dot.}. 



diatropism (diat'ropizm) n. [Gk. dia, 

 through ; trepein, to turn.] The 

 tendency of plants or organs of 

 plants to place themselves at right 

 angles to the line of action of the 

 stimulus (bot.}. 



diaxon (dlak'son) a. [Gk. dis, twice ; 

 axon, axis.] With two axes, as 

 certain sponge spicules (zool.}. 



diaxone (dlak'son) n. [Gk. dis, twice ; 

 ax-on, axis.] A nerve-cell with two 

 cylinder axes (anat.}. 



diblastula (dlblas'tula) n. [Gk. dis, 

 twice ; blastos, bud.] A coelenter- 

 ate embryo consisting of two layers 

 arranged round a central cavity 

 (zool.}. 



dibranchiate (dlbrangTcTat) a. [Gk. 

 dis, twice ; brangchift, gills.] With 

 two gills (zool.}. 



dicellate (dlseTat) a. [Gk. dikella, a 

 two-pronged hoe.] With two 

 prongs ; appl. sponge spicules 

 (zool.}. 



dichasium (dlkaz'Tum) n. [Gk. di- 

 chazein, to divide in two.] An 

 inflorescence in which two buds 

 always develop just below the 

 terminal bud (bot.}. 



dichlamydeous (dl'klamld'eus) a. 

 [Gk. dis, twice ; chlamys, cloak.] 

 Having both calyx and corolla 

 (bot.}. 



dichogamy (dikog'ami) n. [Gk. 

 dicha, in two ; gamos, union.] The 

 maturing of the microsporophylls 

 and the macrosporophylls at 

 different times, thus ensuring cross- 

 pollination (bot.}. 



dichoptic (dlkop'tlk) a. [Gk. dicha, 

 in two ; opsis, sight.] With the 

 eyes quite separate (zool.}. 



dichotomous (dlkflt'omus) a. [Gk. 

 dicha, in two ; temnein, to cut.] 

 Pert., situated near, or characterized 

 by dichotomy (bot.}. 



dichotomy (dlkot'oml) n. [Gk. dicha, 

 in two ; temnein, to cut.] Branching 

 which results from the division of 

 a growing point with two equal 

 parts (bot., zool.}. 



dichromatic (dl'kromat'lk) a. [Gk. 

 dt, two ; chroma, colour.] With 

 two colour varieties (biol.}. 



diclinous (dfidinus, dlkli'nus) a. [Gk. 

 di, two ; kline, bed.] With the 

 stamens and pistils on separate 

 flowers (bot.}. 



dicoccous (dlkok'us) a. [Gk. di, two ; 

 kokkos, seed.] Having two one- 

 seeded coherent capsules (bot.}. 



dicostalia (dl'kcteta'lla) n. [Gk. di, 

 two ; L. costa, rib.] The secundi- 

 branchs or second brachial series 

 in a Crinoid (zool.}. 



dicotyledon (dlk5t!le'don) n. [Gk. 

 di, two ; kotyledon, cup-shaped 

 hollow.] A plant with two seed- 

 leaves (bot.}. 



dictyodromous (dlk'tlSd'ro'mus) a. 

 [Gk. diktyon, net ; dromein, to run.] 

 Net-veined, when the smaller veins 

 branch and anastomose freely (bot.}. 



dictyogen (dlk'tlqje'n) n. [Gk. diktyon, 



