| hexactinelline | <zoology> Belonging to the Hexactinellinae, a group of sponges, having siX-rayed siliceous spicules. Origin: From NL. Hexactinellinae, fr. Gr. Six + a dim. Of, a ray. Source: Websters Dictionary (01 Mar 1998) |
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| hexactinia | <zoology> The Anthozoa. Origin: NL. See Hex-, and Actinia. Source: Websters Dictionary (01 Mar 1998) |
| hexad | <chemistry> An atom whose valence is six, and which can be theoretically combined with, substituted for, or replaced by, six monad atoms or radicals; as, sulphur is a hexad in sulphuric acid. Also used as an adjective. Origin: L. Hexas, hexadis, the number six, Gr, fr. Six. Source: Websters Dictionary (01 Mar 1998) |
| hexadactylous | <zoology> Having six fingers or toes. Origin: Gr.; six + finger: cf. F. Hexadactyle. Source: Websters Dictionary (01 Mar 1998) |
| hexadactyly | The presence of six fingers or six toes on one or both hands or feet. Origin: hexa-+ G. Daktylos, finger (05 Mar 2000) |
| hexadecane | <chemistry> See Hecdecane. Source: Websters Dictionary (01 Mar 1998) |
| hexadecanoic acid | <biochemistry> One of the most widely distributed of fatty acids. The palmitoyl residue is one of the common acyl residues of membrane phospholipids. It is also found as a thioester attached to cystein residues on some membrane proteins. The proteins so modified are often transmembrane proteins and the modified residue is on the cytoplasmic surface of the membrane. The specificity of the transferase for the acyl residue is not high and both stearoyl and oleoyl residues can replace the palmitoyl residue. Compare: myristoylation. (18 Nov 1997) |
| hexadimethrine | <chemical> N,n,n',n'-tetramethyl-1,6-hexanediamine polymer with 1,3-dibromopropane. Synthetic polymer which agglutinates red blood cells; used as a heparin antagonist. Pharmacological action: heparin antagonists. Chemical name: 1,6-Hexanediamine, N,N,N',N'-tetramethyl-, polymer with 1,3-dibromopropane (12 Dec 1998) |
| hexadiphane | 1-(3,3-diphenylpropyl)hexamethyleneimine;an intestinal antispasmodic with choleretic properties. Synonym: hexadiphane. (05 Mar 2000) |
| Hexadnovirus | A genus in the family Hepadnaviridae, which is the cause of hepatitis B in man and certain animals. (05 Mar 2000) |
| hexafluorenium bromide | Hexamethylenebis[fluoren-9-yldimethylammonium bromide];a potentiator for succinylcholine in anaesthesiology by producing a mild nondepolarising neuromuscular blockade; also inhibits plasma cholinesterase. (05 Mar 2000) |
| hexagon | <geometry> A plane figure of six angles. Regular hexagon, a hexagon in which the angles are all equal, and the sides are also all equal. Origin: L. Hexagonum, Gr. Six-cornered; six (akin to E. Six) + angle. Source: Websters Dictionary (01 Mar 1998) |
| hexagonal | Having six sides and six angles; six-sided. Hexagonal system. <chemistry> See Crystallization. Origin: Cf. F. Hexagonal. Source: Websters Dictionary (01 Mar 1998) |
| hexagynia | <botany> A Linnaean order of plants having six pistils. Origin: NL, fr. Gr. Six + a woman, female: cf. F. Hexagynie. Source: Websters Dictionary (01 Mar 1998) |
| hexagynous | <botany> Having six pistils. Origin: Cf. F. Hexagyne. Source: Websters Dictionary (01 Mar 1998) |