Definition of "oleaginous"

[…] the use of Linseed-oyl, Tar, or such oleaginous Matter, tends much to their Preservation and Duration.

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

Looking back, it seemed to me that a slight oleaginous mist was still hovering round the chair.

1929, Sir Arthur Conan Doyle, The Disintegration Machine‎

His once-black hair had faded to the color of used steel wool and now covered his bony skull in a peculiar oleaginous fuzz.

2000, Joyce Carol Oates, Blonde, page 677

Cruz was obviously analogizing Bernie Sanders to the Bolsheviks and Hillary Clinton to the Mensheviks. The oleaginous Texan is an erudite slyboots, but his history is off-kilter.

2015 November 1, Hendrik Hertzberg, “That G.O.P. Debate: Two Footnotes”, in The New Yorker‎

The oleaginous Mike Pence, with his talent for toadyism and appetite for obsequiousness, could, Trump knew, become America’s most repulsive public figure.

2018 May 9, George F. Will, “Trump is no longer the worst person in government”, in The Washington Post

She runs a mentoring scholarship programme for women, administered by a tiresome, oleaginous would-be conductor, played by Mark Strong, and there are rumours that this is a source of young women with whom Tár has affairs.

2023 January 11, Peter Bradshaw, “Tár review – Cate Blanchett is perfect lead in delirious, sensual drama”, in The Guardian‎