| hexahedron | Origin: Hexa- + Gr. Seat, base, fr. To sit: cf. F. Hexaedre. <geometry> A solid body of six sides or faces. Regular hexahedron, a hexagon having six equal squares for its sides; a cube. Source: Websters Dictionary (01 Mar 1998) |
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| hexahydroxycyclohexane | A member of the vitamin B complex necessary for growth of yeast and of mice, absence from the diet causes hair loss and dermatitis in mice. (27 Sep 1997) |
| hexamer | See: virion. 2. A complex or compound containing six subunits or moieties (e.g., a protein complex with six polypeptide chains or an oligopeptide with six amino acid residues). Origin: hexa-+ G. Meros, part (05 Mar 2000) |
| hexameric | Containing six subunits or moieties. (05 Mar 2000) |
| hexamerous | <botany> In six parts; in sixes. Origin: Hexa- + Gr. Part. Source: Websters Dictionary (01 Mar 1998) |
| hexametazime | A lipophilic substance that readily crosses the blood-brain barrier; combined with 99mTc to produce a radiopharmaceutical for SPECT imaging or cerebral blood flow estimates. Synonym: hexamethylpropyleneamine oxime. Acronym: HMPAO (05 Mar 2000) |
| hexameter | A verse of six feet, the first four of which may be either dactyls or spondees, the fifth must regularly be a dactyl, and the sixth always a spondee. In this species of verse are composed the Iliad of Homer and the aeneid of Virgil. In English hexameters accent takes the place of quantity. "Leaped like the | roe when he | hears in the | woodland the | voice of the | huntsman." (Longfellow) "Strongly it | bears us a- | long on | swelling and | limitless | billows, Nothing be- | fore and | nothing be- | hind but the | sky and the | ocean." (Coleridge) Origin: L, fr. Gr. Of six meters; (sc) hexameter verse; six + measure: cf. F. Hexametre. See Six, and Meter. Source: Websters Dictionary (01 Mar 1998) |
| hexamethone bromide | Hexamethylenebis(trimethylammonium chloride);a ganglionic blocking agent used in the treatment of hypertension, usually in combination with other hypotensive drugs; also used as the bromide and the tartrate. Synonym: hexamethone bromide, vegalysen. (05 Mar 2000) |
| hexamethonium | <chemical> A nicotinic cholinergic antagonist often referred to as the prototypical ganglionic blocker. It is poorly absorbed from the gastrointestinal tract and does not cross the blood-brain barrier. It has been used for a variety of therapeutic purposes including hypertension but, like the other ganglionic blockers, it has been replaced by more specific drugs for most purposes, although it is widely used a research tool. Pharmacological action: antihypertensive agents, ganglionic blockers, nicotinic antagonists. Chemical name: 1,6-hexanediaminium, N,N,N,N',N',N'-hexamethyl- (12 Dec 1998) |
| hexamethonium chloride | Hexamethylenebis(trimethylammonium chloride);a ganglionic blocking agent used in the treatment of hypertension, usually in combination with other hypotensive drugs; also used as the bromide and the tartrate. Synonym: hexamethone bromide, vegalysen. (05 Mar 2000) |
| hexamethonium compounds | <chemical> Compounds containing the hexamethylenebis(trimethylammonium) cation. Members of this group frequently act as antihypertensive agents and selective ganglionic blocking agents. Pharmacological action: antihypertensive agents, ganglionic blockers. (12 Dec 1998) |
| hexamethylmelamine | A drug which liberates formaldehyde in an acid urine; used as a urinary antiseptic. (05 Mar 2000) |
| hexamethylphosphoramide N-demethylase | <enzyme> Cytochrome p-450 dependent Registry number: EC 1.5.1.- Synonym: hempa n-demethylase, hmpa n-demethylase (26 Jun 1999) |
| hexamethylpropyleneamine oxime | A lipophilic substance that readily crosses the blood-brain barrier; combined with 99mTc to produce a radiopharmaceutical for SPECT imaging or cerebral blood flow estimates. Synonym: hexamethylpropyleneamine oxime. Acronym: HMPAO (05 Mar 2000) |
| hexamidine isethionate | P,p'-(Hexamethylenedioxy)dibenzamidine bis(beta-hydroxyethanesulfonate);a topical antiseptic. (05 Mar 2000) |