DIP- 



78 



DIS- 



ganglion.] With the ganglia 

 usually arranged in pairs (zool.). 



diplogenesls (dip'lqjen'e'sis) n. [Gk. 

 diploos, double ; genos, birth.] The 

 supposed change in the germ plasm 

 that accompanies the "use and 

 disuse" changes occurring in the 

 body tissues (biol.). 



diploic (diplo'ik) a. [Gk. diploos, 

 double.] Occupying channels in 

 the cancellous tissue of certain 

 bones (anat.). 



diplonephridia (dip'lonefrid'ia) n. plu. 

 [Gk. diploos, double ; nephros, 

 kidney.] Nephridia derived partly 

 from ectoderm, partly from meso- 

 derm (zool.). 



diploneural (dip'ldnu'ral) a. [Gk. 

 diploos, double ; neuron, nerve.] 

 Supplied with two nerves (anat.). 



diploperistomous (dip'l6p6ris'tomus) 

 a. [Gk. diploos, double ; peri, 

 around ; stotna, mouth.] Having 

 a double projection or peristome 

 (hot.). 



diploplacula (dip'ldplak'ula) n. [Gk. 

 diploos, double; plakoeis, flat.] A 

 flattened blastula consisting of two 

 layers of cells (biol.}. 



diplopore (dip'lopor) n. [Gk. diploos, 

 double ; poros, pore.] Respiratory 

 organ in the Cystoidea (zool.). 



diplosoine (dip'losom) n. [Gk. diploos, 

 double ; soma, body.] A double 

 centrosome lying outside the 

 nuclear membrane (cyt.). 



diplosphene (dip'ldsfen) n. [Gk. 

 diploos, double ; sphen, wedge.] 

 A wedge-shaped process on the 

 neural arch of the vertebrae of 

 certain fossil Reptiles (pal.). 



diplospondylic (dip'lospondil'ik) a. 

 [Gk. diploos, double ; sphondylos, 

 vertebra.] With two centra to 

 each myotome, or with one centrum 

 and a well-developed intercentrum 

 (zool.). 



diplostemonous (dip'lostem'dnus) a. 

 [Gk. diploos, double ; stemon, warp.] 

 With two whorls of stamens in 

 regular alternation with the perianth 

 leaves (dot.). 



diplotegia (dip'lote'jia) n. [Gk. 

 diploos, double ; tegos, roof.] An 

 inferior fruit with dry indehiscent 

 pericarp (bot.). 



dipnoan (dip'noan) a. [Gk. dis, 



twice ; pnein, to breathe.] Breath- 

 ing by gills and lungs (zool.). 



diprotodont (dipro'todont) a. [Gk. 

 dis, twice ; protos, first ; oaous, 

 tooth.] Having the two anterior 

 incisors large and prominent, the 

 rest of the incisors and canines 

 being smaller or absent (zool.). 



dipterocecidlum (dip'terdsesid'umi) 

 n. [Gk. dis, twice ; pteron, wing ; 

 kekis, gall nut.] A gall caused by 

 any insect (biol.). 



dipterous (dip'terus) a. [Gk. dis, 

 twice ; pteron, wing.] With two 

 wings or wing-like expansions (bot., 

 zool.). 



directive body, a polar body (cyt.). 



directive mesenteries, in Zoan- 

 tharia, the dorsal and ventral pairs 

 of mesenteries (zool.). 



directive sphere, attraction sphere 

 (cyt.). 



disc (disk) n. [Gk. diskos, disc.] 

 Any flattened portion like a disc 

 in shape (bot., zool.); the circumoral 

 area in many animals ; the circular 

 areas at the opposite poles of many 

 animals (zool.) ; any modification 

 of the thalamus (bot.) ; the area 

 marking the entrance of the optic 

 nerve into the eye ; cup-shaped 



- tactile structures in the skin ; the 

 mass of cells of the membrana 

 granulosa which projects into the 

 cavity of the egg follicle (anat.). 



disc-florets, the inner florets borne 

 on the abbreviated and reduced 

 peduncle in many inflorescences 

 (bot.). 



discal (dis'kal) a. [Gk. diskos, disc.] 

 Pert, any disc-like structure. 



discal (dis'kal) n. [Gk. diskos, disc.] 

 A large cell at the base of the wing 

 of lepidopterous insects completely 

 enclosed by wing-nervures ; also 

 in some Diptera (zool.). 



disciflorous (dis'kiflo'rus, dis'iflo'rus) 

 a. [Gk. diskos, disc ; L. flos, 

 flower.] With flowers in which 

 the receptacle is large and disc- 

 like (bot.). 



discoblastic (dis'kdblas'tik) a. [Gk. 

 diskos, disc ; blastos, bud.] Pert. 

 meroblastic eggs in which the area 

 of segmentation is disc-shaped 

 (zool.). 



discoblastula (dls'kdblas'tula) n. [Gk. 



