NUD- 



211 



OBL- 



nudicaudate (nu'dlkod'at) a. [L. 

 nudus, naked ; cauda, tail.] Having 

 a tail not coveredbyhairorfur(.sw/.). 



nudlcaulous (nu'dikol'us) a. [L. 

 nudus, naked ; caulis, stem.] Appl, 

 stems without leaves (dot.}. 



nudlflorous (nu'diflo'rus). [L. nudus, 

 naked ;flos, flower.] Having flowers 

 without glands or hairs (bot). 



nummulation (num'ula'shun) n. [L. 

 nummus, coin.] The tendency of 

 red blood corpuscles to adhere 

 together like piles of coins (phys). 



nummulitic (num'ulit'ik) a. [L. num- 

 mus, coin.] Like or pert, a Num- 

 mulite (zool., pal.}. 



nuptial flight, the flight taken by 

 the queen bee when fertilization 

 takes place (zool.}. 



nurse cells, single cells or layers of 

 cells attached to or surrounding 

 an egg-cell, probably for elaboration 

 of its food-material (cyt.}. 



nurse generation, an asexual bud- 

 ding generation of some Tunicates, 

 in which the phorozooids act as 

 foster parents to the later formed 

 buds, the gonozooids (zool.}. 



nut (nut) n. [A.S. knutu, nut.] A 

 dry, hard, indehiscent one-celled 

 fruit (bot.). 



nutation (nuta'shun) n. [L. nutare, 

 to nod.] Curvature or change of 

 position in organs of a growing 

 plant (hot.}. 



nutlet (nut'let) n. [Dim. of nut.] The 

 stone formed in drupaceous fruits 

 (hot.}. 



nutricism (nu'trisizm) n. [L. nutrix, 

 nurse.] Symbiotic relationship with 

 all the benefit to one partner (biol.). 



nutrition (nutrish'un) n. [L. nutrix, 

 nurse.] The ingestion and assimila- 

 tion of food materials of animals 

 and plants (phys). 



nutritive (nu'tritlv) a. [L. nutrix, 

 nurse.] Concerned in the function 

 of nutrition ; appl. yolk, polyp, 

 zooid, plasma. 



nyctipelagic (nlk'tfpelaj'ik) a. [Gk. 

 nyktios, nightly ; pelagos, the sea.] 

 Rising to the surface of the sea 

 only at night (zool.}. 



nyctitropism (niktit'ropizm) n. [Gk. 

 nyktios, nightly ; trepein, to turn.] 

 Tendency of certain leaves to curve 

 upwards at night (bot.). 



nymph (ntmf) n. [Gk. nymphe, bride.] 

 A stage following the larval in 

 insect metamorphosis (zool.). 



bride.] The labia minora (anat.). 



O 



oar-feathers, the wing feathers used 

 in flight in Birds (zool.). 



obcompressed (ob'komprgst') a. [L. 

 o&, towards ; comprimere, to com- 

 press.] Flattened in a vertical 

 direction (bot.). 



obcordate (obkor'da.t) a. [L. ob, 

 against ; cor, the heart.] Heart- 

 shaped ; appl. leaves which have 

 the stalk attached to the apex of 

 the heart (bot.}. 



obdiplostemonous (6bdiplost6m'6nus) 

 a. [L. 06, against ; Gk. diploos, 

 double ; stemon, a warp.] With 

 the outer series of stamens opposite 

 the petals (bot). 



obelion (obe'lion) n. [Gk. obelos^ a 

 spit.] The point between the two 

 foramina on the interparietal suture 

 (anat.). 



obex (o'beks) n. [L. obex, an obstacle.] 

 A triangular layer of grey matter 

 above the calamus in the roof of 

 the fourth ventricle (anat.). 



obimbricate (obtm'brikat) a. [L. ob, 

 in the way ; imbrex, a tile.] With 

 regularly overlapping scales, with 

 the overlapping ends downwards 



oblanceolate (oblan'seolat) a. [L. ob, 

 reversely ; lancea, a spear.] In- 

 versely lanceolate (bot.). 



obligate or obligatory parasites, 

 parasites which are limited to one 

 mode of life, and cannot exist inde- 

 pendently of a host ; cf. facultative 

 (biol.). 



oblique- (oblek') a. [L. obliquus, bent.] 

 Placed obliquely ; appl. certain 

 muscles (anat.) ; asymmetrical (bot.). 



obliquus (oble'kwus) a. [L. obliquus, 

 bent.] Oblique ; appl. muscles 

 (anat.). 



obliterate (obllt'grat) a. [L. ob^ re- 

 versely ; litera, a letter.] Indis- 

 tinct or profuse ; appl. markings on 

 insects (zool.). 



