DEL- 



71 



DEU- 



delomorphous (de'lomor'fus) a. [Gk. 

 delos, visible ; morphe, shape.] With 

 definite form, appl. oxyntic cells of 

 the gastric glands (anat.). 



delthyrium (dglthl'rium) n. [Gk. 

 delos, visible ; thyrion, little door.] 

 The opening between the hinge 

 and beak for the peduncle exit in 

 many Brachiopods (zoo/.). 



deltidium (deltld'ium) n. [Gk. A, 

 delta.] A plate covering the del- 

 thyrium (zoo/.). 



deltoid (deftoid) a. [Gk. A, delta; 

 eidos, resemblance.] More or less 

 triangular in shape, appl. nerves, 

 muscles, etc. (anat.} ; appl. the oral 

 Mates on the calyx of the Blastoids 



plates ( 

 (zoo/.). 



demersal (demeYsal) a. [L. demer- 

 gere, to demerse.] Sunk ; appl. fish 

 eggs which sink to the bottom 

 (zoo/.). 



deiniplate (dem'iplat) n. [L. dimidius, 

 half ; platus, flat.] Plate cut off by 

 the fusion of adjoining plates behind 

 it from the central suture line of the 

 ambulacral area in Echinoderms 

 (zoo/.). 



demisheath (dgm'Isheth) n. [L. 

 dimidius, half; A.S. sceath, sheath.] 

 One of the protecting covers of the 

 ovipositor (zoo/.). 



demoid (de'moid) a. [Gk. demos, the 

 common people.] Abundant (pal.). 



dendriform (den'driform) a. [Gk. 

 dendron, tree ; L. forma, shape.] 

 Tree-like (dial.). 



dendrite (dSn'drit) n. [Gk. dendron, 

 tree.] A branched tree-like proto- 

 plasmic process of a nerve cell 

 (anat.). 



Dendrogaea (dSn'droje'a) n. [Gk. 

 dendron, tree ; gaia, earth.] A zoo- 

 geographical region, including all 

 the Neotropical region except 

 temperate South America (bio/.). 



dendron (deVdron) n. See dendrite. 



dens(denz)w. [L. dens, tooth.] Tooth, 

 or tooth-like process (anat.). 



dental (den'tal) a. [L. dens, tooth.] 

 Pert, teeth ; appl. nerves, blood- 

 vessels, canals, furrows, papillae, 

 tissue, etc. (anat.). 



dentary (den'tari) a. [L. dens, tooth.] 

 Pert, dentaries, membrane bones in 

 lower jaw of many vertebrates 

 (zoo/.). 



dentate (dgn'tat) a. [L. dens, tooth.] 

 With sharp saw-like teeth on the 

 margin (zoo/., dot.). 



dentate ciliate, with teeth and hairs 

 on the margins ; appl. leaves 

 (dot.). 



dentate crenate, with marginal teeth 

 somewhat rounded (dot.). 



denticles (den'tiklz) n. plu. [L. dens, 

 tooth.] The paragnaths of certain 

 Polychaets ; the teeth within the 

 secondary orifice in Polyzoa ; the 

 scales of certain Elasmobranchs 

 (zoo/.). 



dentinal (den'tinal) a. [L. dens, tooth.] 

 Pert, dentine (anat.). 



dentine (dgn'tin) n. [L. dens, tooth.] 

 A hard, highly elastic substance 

 composing the greater part of every 

 tooth, a collagen (anat.). 



dentition (dgntish'un) n. [L. dens, 

 todth.] The number, arrangement, 

 and kind of teeth in the jaws of an 

 animal (anat.). 



depigmentation (depTg'me'nta'shun) n. 

 [L. de, away ; pingere, to paint.] 

 The destruction of colour in a cell, 

 either by natural or experimental 

 physiological processes (phys.). 



deplanate (dep'lanat) a. [L. deplan- 

 are, to level.] Levelled, flattened 

 (dot.). 



depressant (depres'ant) n. [L. de- 

 priinere, to lower.] Anything that 

 lowers vital activity (phys.). 



depressed (deprgst') a. [L. deprimere, 

 to lower.] Flattened in a vertical 

 direction (diol.). 



depressomotor (deprSs'omo'tor) n. 

 [L. deprimere, to lower ; movere, to 

 move.] Any nerve which lowers 

 muscular activity (anat.). 



depressor (depreVor) n. [L. depri- 

 mere, to lower.] Any muscle which 

 lowers or depresses any structure; 

 appl. a nerve which lowers the 

 activity of an organ (anat.). 



derm (dSrm) . [Gk. derma, skin.] 

 The layers of the integument below 

 the epidermis (anat.). 



derma (deYma) n. See derm. 



dermal (der'mal) a. [Gk. derma, 

 skin.] Pert, derma, or skin (anat.). 



dermalia (deYma'lia) n. plu. [Gk. 

 derma, skin.] Microscleres in the 

 dermal membrane in Sponges 

 (zoo/.). 



