DER- 



72 



DEU- 



dermarticulare (deVmartTk'ula're, 

 -ara) n. [Gk. derma, skin ; L. 

 articulare, to divide into joints.] 

 The goniale (zoo/.). 



derrnatogen (der'matqje'n) n. [Gk. 

 derma, skin ; gignesthai, to produce.] 

 The young or embryonic epidermis 

 in plants (bo/.). 



dermatoplasm (deVmatoplazm') n. 

 [Gk. derma, skin ; plasma, some- 

 thing moulded.] The cell-wall 

 protoplasm (bol.). 



dermatoplast (deVmatoplast') n. [Gk. 

 derma, skin ; plastos, moulded.] A 

 protoplast with a supposed cell-wall 

 (biol.). 



dermatopsy (deYmatop'si) n. [Gk. 

 derma, skin ; ^^w, sight.] Condi- 

 tion of seeing with the skin, i.e. 

 with a skin sensitive to light (zoo/.). 



dermatosome (deVmatosom') . [Gk. 

 derma, skin ; soma, body.] One of 

 vital units forming a cell-membrane 



dermic (der'mik) a. [Gk. derma, 

 skin.] Pert, skin, or derived from 

 the skin (zoo/.). 



dennis (deYmis) n. [Gk. derma, 

 skin.] See derm. 



dermoblast (der'moblast') n. [Gk. 

 derma, skin ; blastos, bud.] The 

 layer of mesoblast which gives rise 

 to the derma (anat.). 



dermoossification (deVmoos'ifika'- 

 shun) n. [Gk. derma, skin ; L. 

 os, bone ; fieri, to become.] A 

 bone formed in the skin (zoo/.). 



dermosclerites (deVmoskleYfts) n.plu. 

 [Gk. derma, skin ; skleros, hard.] 

 Masses of spicules found in the 

 tissues of the Alcyonidae (zoo/.). 



dermoskeleton (deYmoskeTe'ton) n. 

 [Gk. derma, skin ; skeletos, dried.] 

 See exoskeleton. 



dertrotheca (deYtrothe'ka) n. [Gk. 

 dertron, beak ; theke, cup.] The 

 horny casing of the maxilla of 

 birds (zoo/.). 



dertrum (deVtrum) n. [Gk. dertron, 

 beak.] Any modification of the 

 casing of the maxilla in birds 

 (zoo/.). 



descendence (desSn'dSns) n. [L. de, 

 down ; scandere, to climb.] Descent 

 from some ancestor, usually a 

 common ancestor (biol.). 



descending (desen'ding) a. [L. de, 



down ; scandere, to climb.] Directed 

 towards the caudal region ; appl. 

 blood-vessels, nerves, etc. (ana/.). 



desegmentation (deseg'me'nta'shun) 

 n. [L. de, from ; segmentum, piece 

 cut off.] Fusion of segments origin- 

 ally separate (zoo/.). 



deserticolous (de"zertlk'6lus) a. [L. 

 desertus, solitary ; colere, to inhabit.] 

 Desert-inhabiting (zoo/.). 



desma (des'ma) n. [Gk. desma, bond.] 

 The megasclere which forms the 

 characteristic skeletal network of 

 the Lithistida, an irregular branched 

 spicule (zoo/.). 



desmactinic (des'maktm'ik) a. [Gk. 

 desma, bond ; aktis, ray.] With 

 the podia continued upwards to 

 the apical plate, appl. Stelleroidea ; 

 cf. lysactinlc (zoo/.). 



desmogen (des'mqjen) n. [Gk. desma, 

 bond ; gignesthai, to produce.] 

 Merismatic tissue (bot.). 



desmognathous (desmog'nathus) a. 



eik. desma, bond ; gnathos, jaw.] 

 aving the maxillo-palatines fused 

 with one another in the middle line 

 owing to certain other peculiarities 

 in the skull ; appl. birds (zoo/.). 



desquamation (des'kwama'shun) n. 

 [L. de, away ; squama, scale.] The 

 shedding of the cuticle or epidermis 

 in flakes (zoo/.). 



determinant (deter'mmant) n. [L. 

 determinare, to limit.] A hypo- 

 thetical unit, being an aggregation 

 of biophores determining the de- 

 velopment of a cell or an inde- 

 pendently variable group of cells 

 (biol.). 



determinate (deter'minat) a. [L. 

 determinare, to limit.] With certain 

 limits ; appl. inflorescence with the 

 primary axis terminated early with 

 a flower-bud (bot.) ; appl. cleavage 

 (emb.). 



detorsion (detor'shun) n. [L. de, 

 away ; torquere, to twist.] Torsion 

 in an opposite direction to that 

 of the original, resulting in a more 

 or less posterior position of the 

 anus and circumanal complex (zoo/.). 



deuterocerebrum (du'terb'se'r'e'brum) 

 n. [Gk. deuteros, second ; kerebron, 

 brain.] That portion of the Crusta- 

 cean brain from which the anten- 

 nular nerves arise (zoo/.). 



