| octan | Applied to fever, the paroxysms of which recur every eighth day, the day of a paroxysm being counted as the first in the computation. Origin: L. Octo, eight (05 Mar 2000) |
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| octandioic acid | HOOC-(CH2)6-COOH;used in plastics and in the cross-linking of biopolymers; found in the urine as a product of ω-oxidation of fatty acids. Synonym: octandioic acid. Origin: L. Suber, cork oak, + -ic (05 Mar 2000) |
| octandria | <botany> A Linnaean class of plants, in which the flowers have eight stamens not united to one another or to the pistil. Origin: NL, fr. Gr. (for eight) +, male, man. Source: Websters Dictionary (01 Mar 1998) |
| octandrous | <botany> Of or pertaining to the Octandria; having eight distinct stamens. Source: Websters Dictionary (01 Mar 1998) |
| octane | See: Octa-] . <chemistry> Any one of a group of metametric hydrocarcons (C8H18) of the methane series. The most important is a colourless, volatile, inflammable liquid, found in petroleum, and a constituent of benzene or ligroin. Source: Websters Dictionary (01 Mar 1998) |
| octanes | Eight-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives. (12 Dec 1998) |
| octanoate | A salt or ester of caprylic acid. Synonym: octanoate. (05 Mar 2000) |
| octanoic acid | CH3(CH2)6COOH;a fatty acid found among the hydrolysis products of fat in butter, coconut oil, and other substances. Synonym: octanoic acid. (05 Mar 2000) |
| octanols | Isomeric forms and derivatives of octanol (c8h17oh). (12 Dec 1998) |
| octanoyl-CoA synthetase | Fatty acid thiokinase (medium chain), a ligase forming acyl-CoA's from medium-chain fatty acids and CoA with the conversion of ATP to AMP and PPi. A key step in activation of fatty acids. Synonym: acyl-activating enzyme, butyryl-CoA synthetase, octanoyl-CoA synthetase. (05 Mar 2000) |
| octant | 1. <geometry> The eighth part of a circle; an arc of 45 degrees. 2. <astronomy> The position or aspect of a heavenly body, as the moon or a planet, when half way between conjunction, or opposition, and quadrature, or distant from another body 45 degrees. 3. An instrument for measuring angles (generally called a quadrant), having an arc which measures up to 9O deg, but being itself the eighth part of a circle. Cf. Sextant. 4. <mathematics> One of the eight parts into which a space is divided by three coordinate planes. Origin: L. Octans, -antis. Fr. Octo eight. See Octave. Source: Websters Dictionary (01 Mar 1998) |
| octapeptide | A peptide made up of eight amino acid residues. (05 Mar 2000) |
| octaploidy | See: polyploidy. (05 Mar 2000) |
| octaprenyl pyrophosphate synthetase | <enzyme> E. Coli enzyme catalyses the condensation of isopentenyl pyrophosphate with farnesyl pyrophosphate to yield octaprenyl pyrophosphate Registry number: EC 2.5.1.- Synonym: octaprenyl diphosphate synthase (26 Jun 1999) |
| octapressin | <chemical> Synthetic analog of lypressin with more vasoconstrictor than antidiuretic action. It is used as a haemostatic. Pharmacological action: haemostatics, renal agents, vasoconstrictor agents. Chemical name: Vasopressin, 2-L-phenylalanine-8-L-lysine- (12 Dec 1998) |