| heptane | <chemistry> Any one of several isometric hydrocarbons, C7H16, of the paraffin series (nine are possible, four are known); so called because the molecule has seven carbon atoms. Specifically, a colourless liquid, found as a constituent of petroleum, in the tar oil of cannel coal, etc. Origin: Gr. "epta seven. Source: Websters Dictionary (01 Mar 1998) |
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| heptanes | Seven-carbon saturated hydrocarbon group of the methane series. Include isomers and derivatives. (12 Dec 1998) |