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Borrowed from French oléagineux, borrowed from Medieval Latin oleāginōsus (oily), from olea (the olive tree or its fruit).


  • (UK) IPA(key): /ˌəʊ.lɪˈædʒ.ɪ.nəs/
  • (US) IPA(key): /ˌoʊ.liˈædʒ.ɪ.nəs/
  • (file)


oleaginous (comparative more oleaginous, superlative most oleaginous)

  1. Oily, greasy.
    • 1707, J[ohn] Mortimer, The Whole Art of Husbandry; or, The Way of Managing and Improving of Land. [], 2nd edition, London: [] J[ohn] H[umphreys] for H[enry] Mortlock [], and J[onathan] Robinson [], published 1708, OCLC 13320837:
      [] the use of Linseed-oyl, Tar, or such oleaginous Matter, tends much to their Preservation and Duration.
    • 1929, Sir Arthur Conan Doyle, The Disintegration Machine[1]:
      Looking back, it seemed to me that a slight oleaginous mist was still hovering round the chair.
  2. (of manner or speech) Falsely or affectedly earnest; persuasively suave.
    The oleaginous salesman convinced me to buy a more expensive car.