TOT- 



328 



TRA 



Having the feet completely webbed 

 (zool.}. 



totipotent (totip'otent) a. [L. totus, 

 all ; potens, powerful.] Appl. blasto- 

 meres which can develop into 

 complete embryos when cut off 

 from the aggregate of blastomeres 

 (emb.}. 



toxaspire (tok'sasplr) n. [Gk. foxon, 

 a bow ; L. spira, a coil.] A spiral 

 spicule of rather more than one 

 revolution (zool.}. 



toxicology (tok'sikol'oji) n. [Gk. 

 toxikon, poison ; logos, discourse.] 

 The science treating of poisons in 

 all aspects. 



toxiferous (toksiferus) a. [Gk. toxi- 

 kon, poison ; L. ferre^ to carry.] 

 Holding or carrying poison. 



toxin (tok'sin) n. [Gk. toxikon, 

 poison.] A poison (phys.}. 



toxon (tok'son) n. [Gk. toxon, a bow.] 

 A toxa or bow-shaped spicule (zool.}. 



toxophores (tok'soforz) n. plu. [Gk. 

 toxikon, poison ; pherein, to carry.] 

 The poisoning qualities of toxin 

 molecules ; cf. haptophores (phys.}. 



trabeculae (trabek'ule) n. plu. [L. 

 trabecula, a little beam.] Plates of 

 sterile cells extending across the 

 sporangium of Pteridophytes ; a 

 row of cells bridging a cavity (dot.} ; 

 two curved bars of cartilage em- 

 bracing the hypophysis cerebri of the 

 embryo (emb.} ; small fibrous bands 

 forming imperfect septa or frame- 

 work of organs (anat., zool.}. 



trabecular (trabeVular) a. [L. tra- 

 becula, a little beam.] Pert, or of 

 the nature of a trabecula ; having 

 a cross-barred framework. 



trabeculate, trabecular. 



trabs cerebri, the corpus callosum. 



trachea (trake'a, tra'kea) n. [L. 

 trachia, windpipe.] The windpipe ; 

 a respiratory tubule of Insects and 

 other Arthropods (zool.} ; the spiral 

 or annular vascular tissue of plants 

 (bot.}. 



trachea! (trake'al) a. [L. trachia, 

 windpipe.] Pert., resembling, or 

 having tracheae ; appl. tissue. 



tracheal gills, small wing-like re- 

 spiratory outgrowths from the 

 abdomen of water larvae of Insects 

 (zool.}.' 



tracheate, tracheal, 



tracheid (trak'eid) n. [L. trachia, 

 windpipe.] An individual thick- 

 ened cell of a tracheal column, 

 where end-walls persist (bot.}. 



tracheidal cells, in transfusion tis- 

 sue, cells resembling tracheids (bot.}. 



trachelate (trak'glat) a. [Gk. tra- 

 chelos, neck.] Narrowed ; as in 

 neck-formation (zool.}. 



trachelomastoid (trak'glomas'toid) a. 

 [Gk. trachelos, neck ; mastos, breast ; 

 eidos, form.] Pert, tracheal region 

 and mastoid process : appl. a 

 muscle (anat.}. 



trachenchyma (trakeng'kima) n. 

 [Gk. trachelos, neck ; engchyma, 

 infusion.] Tracheal vascular tissue 

 (bot.}. 



tracheobronchial (trak'eobrong'kial) 

 a. [Gk. trachelos, neck ; brongchos, 

 a bronchial tube.] Appl. glands 

 (anat.} ; appl. a syrinx formed of 

 the lower end of the trachea and 

 the upper bronchi (zool.}. 



trachyglossate.(trak'iglos'at) a. [Gk. 

 trachys, rough ; glossa, tongue.] 

 Having a rasping or toothed 

 tongue (zool.}. 



tract (trakt) n. [L. trahere, to draw.] 

 A region or area or system con- 

 sidered as a whole, as the aliment- 

 ary tract (anat.}. 



tractellum (trakteTum) n. [L. tra- 

 here, to draw.] A flagellum of the 

 forward end of Mastigophora, with 

 circumduction motion (zool.}. 



tragus (tra'gus) n. [Gk. ' tragos, a 

 goat.] A small pointed eminence 

 in front of the concha of the ear 

 (anat.}. 



trama (tra'ma) n. [L. trama, the 

 woof.] A central core of interwoven 

 hyphae of a fungus conidiophore 

 (bot.}. 



transformation (tranz'forma'shun) n. 

 [L. trans, across ; formare, to 

 form.] Change of form, as in 

 metamorphosis (zool.} ; metabolism 

 (Phys.}. 



transfusion tissue, the tissue of 

 gymnosperm leaves, consisting of 

 parenchymatous and tracheidal 

 cells (bot.}. 



transilient (transll'ignt) a. [L. 

 transilire, to leap over.] Appl. 

 nerve fibres connecting brain con- 

 volutions not adjacent (anat.}. 



