D defs.my
Entry 1 sense Webster, 1913

dibutyl

/(dī̇*bū"tĭl)/ · di·bu·tyl · IPA /[daɪˈbjuːtaɪɫ]/
01 n. A liquid hydrocarbon, C8H18, of the alkane series, being one of several octanes, and consisting of two butyl radicals. Cf. Octane.
  1. 1.
    A liquid hydrocarbon, C8H18, of the alkane series, being one of several octanes, and consisting of two butyl radicals. Cf. Octane.(Chem.) See: Octane