| tetragynous | <botany> Belonging to the order Tetragynia; having four styles. Source: Websters Dictionary (01 Mar 1998) |
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| tetrahedral | 1. Having, or composed of, four sides. 2. <chemistry> Having the form of the regular tetrahedron. Pertaining or related to a tetrahedron, or to the system of hemihedral forms to which the tetrahedron belongs. <geometry> Tetrahedral angle, a solid angle bounded or inclosed by four plane angles. See: Tetrahedron. Source: Websters Dictionary (01 Mar 1998) |
| tetrahedrite | <chemical> A sulphide of antimony and copper, with small quantities of other metals. It is a very common ore of copper, and some varieties yield a considerable presentage of silver. Synonym: gray copper ore, fahlore, and panabase. Origin: So called because the crystals of the species are commonly tetrahedrons. Source: Websters Dictionary (01 Mar 1998) |
| tetrahedron | <geometry> A solid figure inclosed or bounded by four triangles. In crystallography, the regular tetrahedron is regarded as the hemihedral form of the regular octahedron. <geometry> Regular tetrahedron, a solid bounded by four equal equilateral triangles; one of the five regular solids. Origin: Tetra- + Gr. Seat, base, fr. To sit. Source: Websters Dictionary (01 Mar 1998) |
| tetrahexahedral | <chemistry> Pertaining to a tetrahexahedron. Source: Websters Dictionary (01 Mar 1998) |
| tetrahexahedron | <chemistry> A solid in the isometric system, bounded by twenty-four equal triangular faces, four corresponding to each face of the cube. Origin: Tetra- + hexahedron. Source: Websters Dictionary (01 Mar 1998) |
| tetrahydric | Denoting a compound containing four ionizable hydrogen atoms (four acid groups). (05 Mar 2000) |
| tetrahydro- | <prefix> Prefix denoting attachment of four hydrogen atoms; e.g., tetrahydrofolate, H4folate. (05 Mar 2000) |
| tetrahydrocannabinol | <chemical> The delta(1)-3,4-trans-isomer (also referred to as the delta(9)-isomer) is the major pharmacologically active constituent of cannabis sativa l. (marihuana, hashish). Dronabinol, a synthetic form of tetrahydrocannabinol, is used to treat the wasting condition associated with aids and also cancer patients undergoing chemotherapy. Pharmacological action: antiemetics, appetite stimulants, hallucinogens. Chemical name: 6H-Dibenzo(b,d)pyran-1-ol, 6a,7,8,10a-tetrahydro-6,6,9-trimethyl-3-pentyl-, (6aR-trans)- (12 Dec 1998) |
| tetrahydrocannibanol | <chemical> This is the primary intoxicant in marijuana, Cannabis sativa. It is marketed as Marinol and can be legally prescribed to treat nausea associated with chemotherapy and radiation treatment. It has also proven useful in treating glaucoma. (09 Oct 1997) |
| tetrahydrocortisol | <chemical> Chemical name: Pregnan-20-one, 3,11,17,21-tetrahydroxy-, (3alpha,5beta,11beta)- (12 Dec 1998) |
| tetrahydrocortisone | <chemical> Chemical name: Pregnane-11,20-dione, 3,17,21-trihydroxy-, (3alpha,5beta)- (12 Dec 1998) |
| tetrahydrofolate dehydrogenase | <enzyme> An enzyme of the oxidoreductase class that catalyses the reaction 7,8-dihyrofolate and NADPH to yield 5,6,7,8-tetrahydrofolate and NADPH+, producing reduced folate for amino acid metabolism, purine ring synthesis, and the formation of deoxythymidine monophosphate. Methotrexate and other folic acid antagonists used as chemotherapeutic drugs act by inhibiting this enzyme. Chemical name: 5,6,7,8-Tetrahydrofolate:NADP+ oxidoreductase Registry number: EC 1.5.1.3 (12 Dec 1998) |
| tetrahydrofolate methyltransferase | Tetrahydropteroylglutamate methyltransferase; methionine-homocysteine methyltransferase;an enzyme that catalyses the reaction of N5-methyltetrahydrofolate with l-homocysteine to form tetrahydrofolate and l-methionine; a cobalamin-requiring enzyme; a deficiency of this enzyme results in an accumulation of l-homocysteine and neurological abnormalities. Synonym: tetrahydrofolate methyltransferase. (05 Mar 2000) |
| tetrahydrofolic acid | The active coenzyme form of folic acid; participates in one-carbon metabolism. Synonym: coenzyme F. (05 Mar 2000) |