| pentane | <chemistry> Any one of the three metameric hydrocarbons, C5H12, of the methane or paraffin series. They are colourless, volatile liquids, two of which occur in petroleum. So called because of the five carbon atoms in the molecule. See: Penta-. Source: Websters Dictionary (01 Mar 1998) |
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| pentanes | Five-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives. (12 Dec 1998) |