• (n.) A liquid hydrocarbon, C8H18, of the marsh-gas series, being one of several octanes, and consisting of two butyl radicals. Cf. Octane.
Di·bu'tyl noun [ Prefix di- + butyl .] (Chemistry) A liquid hydrocarbon, C 8 H 18 , of the marsh-gas series, being one of several octanes, and consisting of two butyl radicals. Confer Octane .