| thenar eminence | The fleshy mass on the lateral side of the palm; the radial palm; the ball of the thumb. Synonym: eminentia thena'ris, thenar prominence, thenar. (05 Mar 2000) |
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| thenar prominence | The fleshy mass on the lateral side of the palm; the radial palm; the ball of the thumb. Synonym: eminentia thena'ris, thenar prominence, thenar. (05 Mar 2000) |
| thenar space | The more medial of the central palmar spaces, bounded medially by the hypothenar compartment; related distally to the synovial tendon sheaths of digits 3 and 4 and proximally to the common flexor sheath. Synonym: medial midpalmar space, middle palmar space. (05 Mar 2000) |
| thenardite | <chemical> Anhydrous sodium sulphate, a mineral of a white or brown colour and vitreous luster. Origin: Named after the French chemist, L.J.Thenard. Source: Websters Dictionary (01 Mar 1998) |
| thenen | Relating only to the palm, specifically to the radial side. Origin: G. Thenar, palm, + en, in (05 Mar 2000) |
| thenoyltrifluoroacetone | <chemical> 4,4,4-trifluoro-1-(2-thienyl)-1,3-butanedione. Chelating agent and inhibitor of cellular respiration. Pharmacological action: chelating agents. Chemical name: 1,3-Butanedione, 4,4,4-trifluoro-1-(2-thienyl)- (12 Dec 1998) |
| thenyl | The radical of 2-methylthiophene, (SC4H3)CH2-. Compare: thienyl. (05 Mar 2000) |
| thenyldiamine hydrochloride | C14H19N3S HCl; 2-[(2-Dimethylaminoethyl)-3-thenylamino]pyridine hydrochloride;an antihistaminic. (05 Mar 2000) |
| Theobald Smith | See: Smith. (05 Mar 2000) |
| Theobald Smith's phenomenon | A phenomenon observed in guinea pigs that had survived use for diphtheria antitoxin standardization, the animals having been rendered highly susceptible to subsequent inoculation of horse serum. (05 Mar 2000) |
| theobroma | <botany> A genus of small trees. See Cacao. Origin: NL, fr. Gr. A god + food, fr. To eat: cf. F. Theobrome. Source: Websters Dictionary (01 Mar 1998) |
| theobroma oil | The fat obtained from the wasted seed of Theobroma cacao (family Sterculiaceae); it contains the glycerides of stearic, palmitic, oleic, arichidic, and linoleic acids; used as a base for suppositories and ointments and, in operative dentistry, as a lubricant and protective. Synonym: cacao butter, cocoa butter, cacao oil. Origin: G. Theos, a god, + broma, food (05 Mar 2000) |
| theobromic | <chemistry> Of, pertaining to, or designating, an acid extracted from cacao butter (from the Theobroma Cacao), peanut oil (from Arachis hypogaea), etc, as a white waxy crystalline substance. Source: Websters Dictionary (01 Mar 1998) |
| theobromine | <chemistry> An alkaloidal ureide, C7H8N4O2, homologous with and resembling caffeine, produced artificially, and also extracted from cacao and chocolate (from Theobroma Cacao) as a bitter white crystalline substance. Synonym: dimethyl xanthine. Source: Websters Dictionary (01 Mar 1998) |
| theodolite | An instrument used, especially in trigonometrical surveying, for the accurate measurement of horizontal angles, and also usually of vertical angles. It is variously constructed. The theodolite consists principally of a telescope, with cross wires in the focus of its object glass, clamped in Y's attached to a frame that is mounted so as to turn both on vertical and horizontal axes, the former carrying a vernier plate on a horizontal graduated plate or circle for azimuthal angles, and the latter a vertical graduated arc or semicircle for altitudes. The whole is furnished with levels and adjusting screws and mounted on a tripod. Origin: Probably a corruption of the alidade. See Alidade. Source: Websters Dictionary (01 Mar 1998) |