| pentavalent | <chemistry> Having a valence of five; said of certain atoms and radicals. Origin: Penta- + L. Valens, p. Pr. See Valence. Source: Websters Dictionary (01 Mar 1998) |
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| pentavalent gas gangrene antitoxin | Antitoxin specific for the toxin of one or more species of Clostridium that cause gaseous gangrene and associated toxaemia, especially C. Perfringens C. Novyi, C. Histolyticum, and commercially available preparations are usually polyvalent, i.e., contain antitoxin for two or more species. Synonym: pentavalent gas gangrene antitoxin. (05 Mar 2000) |