THE- 



326 



THY- 



thermolysis (thermol'isis) n. [Gk. 

 therme, heat ; lysis, a loosing.] Loss 

 of body heat (phys.). 



thermoscopic (ther'moskop'ik) a. 

 [Gk. therme, heat ; skopein, to view.] 

 Adapted for recognizing changes of 

 temperature, as special sense-organs 

 or eyes of certain Cephalopods 



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thermotaxis (theYmdtak'sts) n. [Gk. 

 therme, heat ; taxis, arrangement.] 

 Reaction to stimulus of heat or cold 

 (Phys.). 



thermotropism (thgrmot'ropizm) n. 

 [Gk. therme, heat ; trope, a turning.] 

 Tendency to turn towards heat, 

 shown by curvature in plants (hot.). 



thesocytes (the'soslts) n. plu. [Gk. 

 thesis, a deposit ; kytos, hollow.] 

 Sponge-cells storing reserve material 

 (zool.}. 



thigmotaxis (thig'motak'sis) n. [Gk. 

 thigma, touch ; taxis, arrangement.] 

 The tendency of minute organisms 

 to attach themselves to objects on 

 contact (biol). 



thigmotropism (thigmot'ropizm) n. 

 [Gk. thigma, touch ; trope, a turn- 

 ing.] The tendency to respond to 

 mechanical contact by clinging and 

 curving, as in tendrils (bot.). 



thoracic (thoras'ik) a. [Gk. thorax, 

 the breast.] Pert, or in the region 

 of the thorax. 



thorax (tho'raks) n. [Gk. thorax, the 

 breast.] In higher vertebrates, that 

 part of the body between neck and 

 abdomen containing heart, lungs, 

 etc. ; the body region behind the 

 head of many Arthropods and of 

 other smaller animals (zool.). 



thread cells, intheskinof Myxinoids, 

 cells whose long threads form a 

 network in which the mucous 

 secretion of the ordinary gland 

 cells is entangled (zool.). 



three-nerved leaf, a leaf with three 

 distinct primary veins (bot.). 



thremmatology (thrgra'atol'djl) n. 

 [Gk. thremma, a nursling ; logos, 

 discourse.] The science of breed- 

 ing animals and plants under 

 domestic conditions (biol.). 



thrombocytes (thrSm'bosits) n. plu. 

 [Gk. thrombos, a clot ; kytos, hollow.] 

 The elementary particles, platelets, 

 or small discs of blood not drawn : 



they clump together in drawn blood 

 (anat.). 



thromboplastin (throm'bdplas'tin) ;/. 

 [Gk. thrombos, a clot ; plastos, 

 moulded.] A substance in drawn 

 blood set free from granular masses 

 of disintegrated thrombocytes 

 (Phys.). 



thyloses (thllo'sez) n. phi. [Gk. 

 thylax, a sack.] Masses of paren- 

 chyma formed inside wood vessels 

 through pressure in secondary wood 

 (bot.). 



thymus (thi'mus) n. [Gk. thyinos, 

 thymus.] An irregular pinkish 

 mass of glandular tissue in the 

 lower anterior part of the neck 

 (anat.). 



thyreohyoid, thyreoid, etc., see 

 thyrohyoid, thyroid, etc. 



thyroarytaenoid (thl'roar'ite'noid) n. 

 [Gk. thyra, a door ; arytaina, a 

 pitcher ; eidos, form.] A muscle of 

 the larynx (anat.). 



thyroepiglottic (thl'roep'iglot'ik) a. 

 [Gk. thyra, door ; epi, upon ; glottis, 

 mouth of windpipe.] Appl. a liga- 

 ment connecting the epiglottis stem 

 and the angle of the thyroid cartil- 

 age (anat.). 



thyroglossal (thi'roglos'al) a. [Gk. 

 thyra, door ; glossa, tongue.] Pert. 

 thyroid and tongue ; appl. an em- 

 bryonic duct (emb.). 



tbyrohyals (thi'rdhl'alz) n. plu. [Gk. 

 thyra, door ; hyoeides, Y-shaped.] 

 The greater cornua of the hyoid 

 bone (anat.). 



thyrohyoid (thl'rohi'oid) a. [Gk. 

 thyra, door ; hyoeides, Y-shaped.] 

 Appl. a muscle extending from 

 thyroid cartilage to hyoid cornu 

 (anat.). 



thyroid (thl'roid) a. [Gk. thyra, door ; 

 eidos, form.] Appl. a ductless 

 highly-vascular gland at the front 

 and sides of the neck ; also to 

 arteries, cartilage, and veins in its 

 region (anat.). 



thyrsoid (theYsoid) a. [Gk. thyrsus, 

 a wand ; eidos, form.] Resembling 

 a thyrsus in shape (bot.). 



thyrsus (ther'sus) n. [Gk. thyrsus, a 

 wand.] A mixed inflorescence with 

 main axis racemose, later axes 

 cymose, with cluster almost double- 

 cone shaped (bot.). 



