Etymology
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oleaginous (adj.)

"oily, unctuous, having the qualities of oil," early 15c., oleaginose (modern from by 1630s), from Old French oléagineux (14c.) and directly from Medieval Latin oleaginus, literally "of the olive," from olea "olive," alteration of oliva (see olive) by influence of oleum "oil." Related: Oleaginousness.

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Definitions of oleaginous

oleaginous (adj.)
unpleasantly and excessively suave or ingratiating in manner or speech;
oleaginous hypocrisy
Synonyms: buttery / fulsome / oily / smarmy / soapy / unctuous
oleaginous (adj.)
containing an unusual amount of grease or oil;
oleaginous seeds
Synonyms: greasy / oily / sebaceous
From wordnet.princeton.edu