NOT- 



210 



NUD- 



noton, back ; chorde, cord.] Pert. 

 or enveloping the notochord ; appL 

 sheath, tissue, etc. (anaf.). 



notocirrus (no'tosir'us) n. [L. notum, 

 back ; cirrus, curl.] The cirrus of 

 the notopodium of a polychaet 

 Annelid (zool.}. 



notonectal (no'tonek'tal) a. [Gk. 

 noton, back ; nektos, swimming.] 

 AppL Notonectidae, which swim 

 back downwards (zool.}. 



notopodium (no'topo'dium) n. [Gk. 

 noton, back ; pous, foot.] The 

 dorsal lobe of a polychaetan para- 

 podium (zoo/.}. 



nototribe (no'totrib) a. [Gk. noton, 

 back ; tribein, to rub.] AppL 

 flowers whose anthers and stigma 

 touch the back of insects as they 

 enter the calyx, a device for secur- 

 ing cross-fertilization (bot.}. 



notum (no'tum) n. [L. notum, back.] 

 The dorsal portion of an insect 

 segment ; tergum (zool.}. 



nucellus (nusel'us) n. [L. dim. of 

 nux, nut.] The central region and 

 chief part of an ovule (hot.). 



nuchal (nu'kal) a. [L. L. nucha, spinal 

 marrow.] AppL two sense organs 

 regarded as olfactory, on the 

 prostomium of Chaetopoda (zool.}. 



nuchal cartilage, a thin shield- 

 shaped plate on the posterior 

 surface of the neck of Sepia 

 (zool.}. 



nuciferous (nusiferus) a. [L. nux, 

 nut ; ferre, to carry.] Nut-bearing 

 (bot.}. 



nucivorous (nusi/orus) a. [L. nux, 

 nut ; -vorare, to devour.] Nut- 

 eating (zool.}. 



nuclear (nu'klear) a. [L. nucleus, 

 kernel.] Pert, the nucleus (bot., 

 zool.}. 



nuclear disc, a star-like structure 

 formed by the chromosomes in the 

 equator of the spindle during 

 mitosis (cyt."). 



nuclear membrane, the delicate 

 membrane bounding a nucleus, 

 formed from the surrounding 

 cytoplasm (cyt.}. 



nuclear plate, the equatorial plate 

 (cyt.}. 



nuclear spindle, a barrel - shaped 

 structure formed of a number of 

 fine fibrils in the cytoplasm sur- 



rounding the nucleus, a stage in 

 mitosis (cyt.}. 



nucleate (nu'kleat) a. [L. nucleus, 

 nucleus.] Having a nucleus (cyt.}. 



nucleation (nuklea'shun) a. [L. 

 nucleus, kernel.] Nucleus forma- 

 tion (cyt.}. 



nucleic (nu'kleik) a. [L. nucleus, 

 kernel.] Pert, an acid containing 

 phosphorus, found in some nuclei 

 (pkys.}. 



nucleiform (nu'klelform) a. [L. 

 nucleus, kernel ; forma, shape.] 

 Shaped like a nucleus (cyt.}. 



nuclein (nu'klein) n. [L. nucleus, 

 kernel.] One of the chemical 

 compounds found in nuclei, 

 similar to protein but with the 

 addition of phosphorus (phys.\ 



nucleochylema (nu'kleoklle'ma) n. 

 [L. nucleus, kernel ; Gk. chylos, 

 juice.] The ground substance of 

 a cell-nucleus (cyt.}. 



nucleohyaloplasm (nu'kleohl'alo- 

 plazm) n. [L. nucleus, kernel ; Gk. 

 hyalos, glass ; plasma, something 

 moulded.] The semi-fluid ground- 

 substance of a nucleus (cyt.}. 



nucleolar (nukle'b'lar) a. [L. nucleus, 

 kernel.] Pert, a nucleolus (cyt.}. 



nucleolus (nukle'olus) n. [L. nucle- 

 olus, dim. of nucleus, little kernel.] 

 A rounded mass of pure plastin 

 occurring in a nucleus (cyt.^. 



nucleomicrosomes (nu'kleoml'kro- 

 somz) n. plu. [L. nucleus, kernel ; 

 Gk. mikros, small ; soma, body.] 

 Nuclear chromatin granules (cyt.}. 



nucleoplasm (nu'kleoplazm) n. [L. 

 nucleus, kernel ; Gk. plasma, some- 

 thing moulded.] Reticular nuclear 

 substance ; cf. cytoplasm (cyt.}. 



nucleoproteid (nu'kleb'pro'teid) n. 

 [L. nucleus, kernel ; Gk. protos, 

 first ; eidos, resemblance.] A nu- 

 clein with much albumin (phys.}. 



nucleus (nu'kleus) n. [L. nucleus, 

 kernel.] A complex spheroidal 

 mass essential to the life of a 

 cell (cyt.}. 



nuculanium (nu'kula'mum) n. [L. 

 nucula, small nut.] A fleshy fruit 

 like a grape (bot.}. 



nudibranchiate (nu'dibrang'kiat) a. 

 [L. nudus, naked ; Gk. brangchia, 

 gills.] Having gills not covered by a 

 protective shell or membrane (zool.}. 



