THORACOMETRY 



544 



THYMOL 



Thoracometry (tho-rak-om f -et-re) \0upac, thorax ; tie- 

 rpov, measure]. Measurement of the movement of 

 the walls of the chest. 



Thoracoschisis (tho-rak-os' '-kis-is) [dupat;, thorax ; 

 gxloiq, a cleaving]. Congenital fissure of the thorax. 



Thoracoscope (tho-rak' -o-skop) [Oupaij, thorax ; oko- 

 irelv, to view]. A stethoscope. 



Thornwaldtitis (torn-valt-i'-tis). Thorn waldt's dis- 

 ease. See Table of Eponymic Diseases (Illus. Diet.). 



Thread. (See Illus. Diet.) T. -formation, filamenta- 

 tion. See Reaction, Th?-ead. Threads, Simonart's. 

 See Bands, Amniotic. 



Threshold. (See Illus. Diet.) Syn., Limen. T., 

 Auditory, the minimum perceptible sound. T., 

 Neuron. See under Neuron. 



Throe {thro) [AS. t/irea, affliction]. A violent pang, 

 agony, anguish. 



Thromballosis (throm-bal-o' '-sis) [6p6fj[ioc, thrombus ; 

 a?i?,oio(Ti£, a change]. The changed condition caused 

 by coagulation of the venous blood. 



Thrombase (throtn 1 '-baz) [dpofxfioc, a clot]. The fibrin- 

 ferment, the animal enzyme that causes the coagula- 

 tion of shed blood. It bears a closer resemblance to 

 rennet than any of the other enzymes known. Syn., 

 Thrombin. 



Thrombocystis (throm-bo-sis' '-tis) \_thrombus ; kvotlq, a 

 bladder]. The sac sometimes enveloping a thrombus. 



Thrombogen. (See Illus. Diet. ) A generic name for 

 the rennets proposed by H. E. Armstrong. Syn., 

 Trombogenic enzyme. 



Thrombosed (throm f -bost). Affected with thrombosis. 



Thrombosin (throm' -bo-sin). Lilienfeld's term for 

 one of the products of the cleavage of fibrinogen by 

 acetic acid. It is a proteid body which passes into 

 fibrin in the presence of soluble calcium salts. 



Thrombosis. (See Illus. Diet. ) See Signs, Grie- 

 singer's. T M Dilation, that which results from a 

 slowing of the blood-current next to the vessel walls, 

 as the result of dilation of a vessel (as in aneurysms, 

 varices) or of the heart. T., Lancereaux's Law of, 

 marantic thromboses always occur at the points where 

 there is the greatest tendency to stasis ; that is, where 

 the influence of the cardiac propulsion and of thoracic 

 aspiration is least. T., Plate. See Thrombus, 

 Autochthonous. 



Thrombostasis (throm-bo-sta' '-sis). Stasis of blood lead- 

 ing to formation of a thrombus. 



Thrombus. (See Illus. Diet.) T., Annular, one that 

 involves the whole circumference of the vessel but 

 does not entirely occlude it. T., Autochthonous, 

 T., Blood-plate, that ascribed by Eberth to agglu- 

 tination of blood-plates. T., Laennec's, a globular 

 thrombus formed in the heart, especially in cases 

 where the latter is the seat of fatty degeneration. T. 

 neonatorum. Same as Cephalhematoma. T., Pari- 

 etal, or Valvular, one adherent to the wall of a 

 vessel or the heart and not entirely occluding the 

 vessel. T. vulvae, T. vaginae, hematoma of the 

 labium pudendi majus. 



Throw (thro) [ME. throwen\ To give birth to ; to 

 bear a foal. 



Throwback {thro' -bak), I. To show reversion in char- 

 acters to those of the offspring of a previous sire or to 

 those of the first sire. Cf. Infection (2), lelegony, 

 Reversion. 2. To reduce in class or rank. 



Thrypsis (thrip'-sis) [dpinfiie, a crushing]. A com- 

 minuted fracture. 



Thujetin [thu' -jet-in). C, 4 H u O g . A dissociation- 

 product of thujin by prolonged heating with sulfuric 

 acid. A yellow crystalline powder similar to quercitrin, 

 soluble in alcohol and ether. 



Thujigenin (thujij'-enin). C u H 13 7 . A crystalline 



substance soluble in alcohol obtained from Thuja 

 occidentalis, L. 



Thujin (thu'-jin). C 20 H ri Oj, (?). A glucosid similar 

 to quercitrin found by Kawalier (1858) in arbor vitse, 

 Thuja occidentalis, L. It forms citron-yellow, micro- 

 scopic, four-sided crystals, soluble in alcohol or boiling 

 water. Its alcoholic solution gives intense yellow 

 coloration with alkalis, and green witli ferric chlorid. 



Thulium (thu'-le-um) [7'hule, northland]. An ele- 

 ment occurring in rare minerals, as gadolinite, dis- 

 covered by P. Th. Cleve, professor of chemistry at 

 Upsala (1879). Symbol Tu ; atomic weight 170.7 ; 

 valency III. 



Thumb. (See Illus. Diet.) T. -exercise. See under 

 Exercise. T. -marks, an impression made by the 

 thumb. See under Identification. T., Stub-. See 

 Stub-thumb. 



Thyiacitis, Thylaciitis (thi-las-i'-tis, thi-las-e-i' -tis) 

 [Ov/MKiov, a little bag]. Acne rosacea. 



Thyma (thi'-mah). A corruption of ecthyma and also 

 of thymion. 



Thymectomy (thi-mek 1 '-to-me) [diifioq, thymus ; inrofiij, 

 a cutting out]. Excision of the thymus. 



Thymegol (thi'-me-gol). An antiseptic and emetic 

 forming a red-brown powder, said to be a parasulfonic 

 derivative of potassium, thymol, and mercury. 



Thymelaea (thi-me-le'-ah) \p\>jioq, thyme ; k/tala, olive 

 tree]. A genus of plants of the order Thymela>ace<z. 

 T. tartonraira, All., a low shrub indigenous to south- 

 ern Europe. The leaves are used as a purgative. 

 T. sonamunda, All., a small shrub indigenous to 

 Europe. The fruit, the seed, and the root are used as 

 a purgative in dropsy. The bark serves as a substitute 

 for mezereon. 



Thymhydroquinone (thlm-hi-dro-fcwin' -on). C 6 H 2 - 

 CH 3 (C 3 H.)(OH), . A reduction -product of thymo- 

 quinone. 



Thymiatechny (thi-mi-at-ek' -ne) [dv/niava, incense ; 

 rixv//, art]. The art of perfuming medicine. 



Thymin (thi'-min). C 5 H e N 2 2 . A crystalline body 

 obtained by Kossel and Neumann (1893) by boiling 

 nucleinic acid from the thymus gland of the calf with 

 dilute sulfuric acid. Miescher's nucleosin from sper- 

 matozoa of salmon is identical with it. It forms four- 

 sided colorless plates, doubly refractive. 



Thyminol (thi'-min-ol). An antiseptic liquid said to 

 be a solution of thymol, eucalyptol, menthol, Bap- 

 tisia tinctoria, P. Br., benzoic, boric, and salicylic 

 acids. 



Thymion (thi'-me-on) [fliy/'ov]. A wart; a condyloma. 



Thymoform (thi' -mo-form). A reaction-product of 

 thymol and formic aldehyd ; a yellowish, tasteless 

 powder, readily soluble in ether, alcohol, chloroform, 

 or olive oil, insoluble in water, petroleum, ether, or 

 glycerin. It is used as iodoform and dermatol. 



Thymohydroquinone. See Thymhydroquinone. 



Thymol. (See Illus. Diet.) Syn., Jl/etacymophenol ; 

 Thyme-camphor ; Thymic acid ; Methylnormalpropyl- 

 phrnol. T. Camphor. See under Camphor. T. 

 Carbonate, a white tasteless, crystalline substance, 

 showing a neutral reaction ; fuses at 49 C. It is 

 recommended as preferable to thymol in uncinariasis. 

 Dose, 30 gr. (2.0 gm. ). Syn., Thymotol. T. Chlor- 

 methylsalicylate, a condensation-product of thymol 

 and chlormefliylsalicylic acid. Antiseptic. T. Sali- 

 cylate, C 10 l I ,'.,() . C.H r p.„ a reaction -product of sodi- 

 um salicylate with sodium thymolate and phosphorus 

 trichlorid, forming a white crystalline powder ; soluble 

 in alcohol and ether. It is an intestinal antiseptic. 

 Syn., Salithvinol. T.-urethane, a compound of 

 thymol and thvmol carbonic ester forming colorless 

 crystals insoluble in water ; used as an anthelmintic. 



