| penta- | 1. <prefix> A combining form denoting five; as, pentacapsular; pentagon. 2. <chemistry> Denoting the degree of five, either as regards quality, property, or composition; as, pentasulphide; pentoxide, etc. Also used adjectively. Origin: Gr, a later combining form of five. See Five. (29 Oct 1998) |
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| pentabasic | <chemistry> Capable of uniting with five molecules of a monacid base; having five acid hydrogen atoms capable of substitution by a basic radical; said of certain acids. Origin: Penta- + basic. Source: Websters Dictionary (01 Mar 1998) |
| pentacapsular | <botany> Having five capsules. Origin: Penta- + capsular. Source: Websters Dictionary (01 Mar 1998) |
| pentachenium | <botany> A dry fruit composed of five carpels, which are covered by an epigynous calyx and separate at maturity. Origin: NL. See Penta-, and Achenium. Source: Websters Dictionary (01 Mar 1998) |
| pentachloride | <chemistry> A chloride having five atoms of chlorine in each molecule. Origin: Penta- + chloride. Source: Websters Dictionary (01 Mar 1998) |
| pentachlorophenol | <chemical> This toxic chemical is used to kill fungi, weeds, bacteria and algae. (09 Oct 1997) |
| pentachlorophenol hydroxylase | <enzyme> Catalyses the conversion of pcp to 2,3,4,5-tetrachlorohydroquinone in the presence of NADPH and oxygen; flavoprotein from flavobacterium sp. Strain atcc 39723 Registry number: EC 1.14.13.- Synonym: pcp hydroxylase, pcp-4-monooxygenase, pcpb gene product, pentachlorophenol-4-monooxygenase (26 Jun 1999) |
| pentacid | <chemistry> Capable of neutralising, or combining with, five molecules of a monobasic acid; having five hydrogen atoms capable of substitution by acid residues; said of certain complex bases. Origin: Penta- + acid. Source: Websters Dictionary (01 Mar 1998) |
| pentacoccous | <botany> Composed of five united carpels with one seed in each, as certain fruits. See: Penta-, Coccus. Source: Websters Dictionary (01 Mar 1998) |
| pentacrinin | <physiology> A red and purple pigment found in certain crinoids of the genus Pentacrinus. Source: Websters Dictionary (01 Mar 1998) |
| pentacrinite | <zoology> Any species of Pentacrinus. Origin: Penta- + Gr. A lily. Source: Websters Dictionary (01 Mar 1998) |
| pentacrinoid | <zoology> An immature comatula when it is still attached by a stem, and thus resembles a Pentacrinus. Origin: Pentacrinus. Source: Websters Dictionary (01 Mar 1998) |
| pentacrinus | <zoology> A genus of large, stalked crinoids, of which several species occur in deep water among the West Indies and elsewhere. Origin: NL. See Penta-, and Crinum. Source: Websters Dictionary (01 Mar 1998) |
| pentacron | Origin: NL, fr. Gr. Five + a summit. <geometry> A solid having five summits or angular points. Source: Websters Dictionary (01 Mar 1998) |
| pentad | <chemistry> Any element, atom, or radical, having a valence of five, or which can be combined with, substituted for, or compared with, five atoms of hydrogen or other monad; as, nitrogen is a pentad in the ammonium compounds. Origin: Gr, a body of five, fr. Five. <chemistry> Having the valence of a pentad. Source: Websters Dictionary (01 Mar 1998) |