TET- 



325 



THE- 



tetraselenodont (te't'rase'le'nodSnt) a. 

 [Gk. tetras, four ; selene, moon ; 

 odous, tooth.] Having four cres- 

 centic ridges on the molar teeth 

 (zool.). 



tetrasepalous (tet'rasgp'alus) a. [Gk. 

 tetras, four ; Gk. sepalon, a sepal.] 

 Having four sepals (bot.). 



tetraspennous (tet'raspeYmus) a. 

 [Gk. tetras, four ; sperma, seed.] 

 Having four seeds (dot.}. 



tetrasporangium (te"t'rasp6ran'jTum) 

 n. [Gk. tetras, four ; sporos, seed ; 

 anggeion, vessel.] A sporangium 

 producing tetraspores, as in Red 

 Algae (bot.). 



tetraspore (tSt'raspor) n. [Gk. tetras, 

 four ; sporos, seed.] One of four 

 non-motile spores produced by the 

 sporangium of Red Algae (bot.). 



tetrastichous (tetrjis'tlkus) a. [Gk. 

 tetras, four ; stichos, row.] Ar- 

 ranged in four rows (hot.}. 



tetrathecal (tgt'rathe'kal) a. [Gk. 

 tetras, four ; theke, a case.] Having 

 four loculi (dot.). 



tetraxon (tgtrak'son) n. [Gk. tetras, 

 four ; axon, axis.] A tetractine. 



tetrazoic (tgt'razo'Ik) a. [Gk. tetras, 

 four ; zoon, animal.] Having four 

 sporozoites ; appl. gregarine spores 

 (zool.). 



tetrazoold (tgt'razo'oid) n. [Gk. tetras, 

 four ; zoon, animal ; eidos, form.] 

 The zooid developed from each of 

 four parts constricted from the 

 stolon process of an embryonic 

 Ascidian (zool.). 



thalamencephalon (thal'ame'nke'f'- 

 alon, -s6f-) n. [Gk. thalamos, a 

 receptacle ; engkephalon, the brain.] 

 The part of the brain comprising 

 the thalamus, the corpora genicu- 

 lata, and the epithalamus (anat.). 



thalamus (thal'amus) n. [Gk. thala- 

 mos, a receptacle.] The receptacle 

 or torus of a flower (hot.) ; part of 

 the brain (anat.). See optic thalaml. 



thalline (thal'ln) a. [Gk. thallos, a 

 young shoot.] Resembling a thallus 

 (dot.). 



thalloid (thal'oid) a. [Gk. thallos, a 

 young shoot ; eidos, form.] Like a 

 thallus (bot.). 



thallome (thal'om) n. A thallus. 



thallus (thal'us) n. [Gk. thallos, a 

 young shoot.] A combination of 



cells presenting no differentiation 

 of leaf and stem, as in Thallophytes 

 (bot.). 



thanatoid (than'atoid) a. [Gk. thana- 

 tos, death ; eidos, form.] Deadly; 

 appl. poisonous snakes. 



thanatology (than'at61'6ji) . [Gk. 

 thanatos, death ; logos, discourse.] 

 Theories of death. 



theca (the'ka) n. [Gk. theke, a case.] 

 A spore or pollen case ; a spor- 

 angium (bot.) ; a structure serving as 

 a protective covering for an organ 

 or organism, as of spinal cord, pupa, 

 proboscis, tube-animal (zool.). 



thecaphore (the'kafor) n. [Gk. theke, 

 a case' ; pherein, to bear.] A struc- 

 ture on which a theca is borne 

 (bot.). 



thecasporous (thekas'pb'rus) a. [Gk. 

 theke, a case ; sporos, a seed.] 

 Having the spores enclosed in 

 cases or thecae (bot.). 



thecate (the'kat) a. [Gk. theke, a 

 case.] Covered or protected by a 

 theca (biol.). 



theciferous (thesif'grus), thesigerous 

 (thesTj'grus) a. Thecate. 



thecium (the'shmm) n. [Gk. theke, a 

 case.] That part of a Fungus or 

 Lichen containing the sporules (&>/.). 



thecodont (the'kodont) a. [Gk. theke, 

 case ; odous, tooth.] Having teeth 

 in sockets (zool.). 



thelyblast (the'liblast) n. [Gk. thelys, 

 female ; blastos, a bud.] A matured 

 female germ cell (biol.). 



thelyotoky (the'H6t'6kT) n. [Gk. 

 thelys, female ; tokos, offspring.] 

 Parthenogenesis in the case where 

 females only are produced (biol.). 



thelyplasm (thellplazm) n. [Gk. 

 thelys, female ; plasma, something 

 moulded.] Female plasm ; cf. 

 arrhenoplasm (biol.). 



thenal (the'nal) a. [Gk. thenar, 

 palm of the hand.] Pert, or in the 

 region of the palm of the hand 

 (anat.). 



thenar (the'nar) n. [Gk. thenar, 

 palm of the hand.] The muscular 

 mass forming the ball of the thumb 

 (anat.). 



thermogenesis (theVmojgn'e'sis) . 

 [Gk. thernte, heat ; genesis, pro- 

 duction.] Body-heat production 

 by oxidation (phys.). 



