DIA- 



74 



DIA- 



between the aboral and the middle 

 primary (zool.). 



dladromous (dl'adro'mus) a. [Gk. 

 diadromos, wandering.] Having 

 the nerves radiating in a fan-like 

 manner (dot.}. 



diaene (dlen') n. [Gk. dis, twice on 

 analogy of triaene, from Gk. triaina, 

 trident.] A form of triaene, with 

 one of the cladi reduced or absent 

 (N). 



diageotropism (dl'ajeot'ropizm) n. 

 [Gk. dia, through ; gaia, earth ; 

 trepein, to turn.] The tendency 

 in certain parts of plants to take 

 a position at right angles to the 

 direction of gravity (dot.}. 



diagnosis (dfagno'sis) n. [Gk. diet, 

 through ; gignoskein, to know.] A 

 concise description of an organism 

 with full distinctive characters 

 (biol.). 



diagnostic (dl'agnos'tik) a. [Gk. diet, 

 through ; gignoskein, to know.] 

 Differentiating the species or genus, 

 etc., from others similar (biol.}. 



diaheliotropism (dl'ahelTot'ropizm) n. 

 [Gk. dia, through ; helios, sun ; 

 trepein, to turn.] The tendency of 

 certain parts of plants to take up 

 a position at right angles to the 

 rays of light (&?/.). 



dialyneury (dl'allnu'rl) n. [Gk. dia, 

 through ; lyein, to loose ; neuron, 

 nerve.] In certain Gastropods, 

 having the pleural ganglia united 

 to the opposite branch of the 

 visceral nerve by an anastomosis 

 of the pallial nerve (zool.}. 



dialypetalous (di'alipeYalus) a. [Gk. 

 dia, asunder ; lyein, to loose ; 

 petalon, petal.] Polypetalous (dot.}. 



dialyphyllous (dl'allfll'us) a. [Gk. 

 diet) asunder ; lyein, to loose ; 

 phyllon, leaf.] With separate 

 leaves (bot.). 



dialysepalous (dl'alisep'alus) a. [Gk. 

 dia, asunder ; lyein, to loose ; 

 sepalon, sepal.] Polysepalous (bot.}. 



dialystely (dl'aliste'li) n. [Gk. dia, 

 asunder ; lyein, to loose ; stele, 

 post.] A condition in which the 

 steles in the stem remain more or 

 less separate (dot.). 



diancistra (di'angkTs'tra) n . [Gk. 

 dis, twice ; angkistron, hook.] A 

 spicule resembling a stout sigma, 



but the inner margin of both hook 

 and shaft thins out to a knife edge 

 and is notched (zool.}. 



diandrous (dlan'drus) a. [Gk. dis, 

 twice ; aner, man.] Having two 

 free stamens (bot.}. 



diapedesis (dlaped'esis, dl'apede'sis) 

 n. [Gk. diapedesis, leaping through.] 

 Emigration of white blood corpuscles 

 through the walls of the capillaries 

 into the surrounding tissue (phys.}. 



diaphototropism (di'afotot'ropizm) ;/. 

 [Gk. dia, through ; p/ws, light ; 

 trepein, to turn.] See diahelio- 

 tropism. 



diaphragm (di'afram) n. [Gk. di- 

 aphragtna, midriff.] The wall 

 which separates the small cell, the 

 prothallus, from the rest of the 

 macrospore in Hydropterideae ; a 

 septum at the nodes in Equisetum 

 (bot.} ; a sheet of muscular tissue 

 attached to the introvert in worms ; 

 the single strongly developed septum 

 in the Terebelliformia ; the per- 

 forated tissue that subdivides the 

 tentacle cavity in Polyzoa ; the 

 transverse septum separating the 

 cephalothorax from the abdomen 

 in certain Arachnids ; a special 

 fan-shaped muscle spreading from 

 the anterior end of the ilia to the 

 oesophagus and base of the lungs 

 in Anura ; a partition partly 

 muscular, partly tendinous, separat- 

 ing the cavity of the chest from the 

 abdominal cavity (zool.}. 



diaphragma (dfafrag'ma) n. See 



diaphysis (diaf'ists) n. [Gk. dia, 

 through ; phyein, to bring forth.] 

 The shaft of a bone as distinguished 

 from the epiphysis (anat.} ; the 

 abnormal growth of an axis or 

 shoot (bot.}. 



diapophysis (di'apof'Ms) n. [Gk. dia, 

 through ; phyein, to produce.] The 

 lateral or transverse process of the 

 neural arches of Anura (zool.}. 



diarch (dl'irk) a. [Gk. dis, twice ; 

 arcke, origin.] With two xylem 

 and two phloem bundles ; appl. 

 root in which the protoxylem 

 bundles meet and form a plate of 

 tissue across the cylinder with the 

 phloem bundle on each side (bot.). 



diarthrosis (dl'arthro'sls) n. [Gk. dia^ 



