Origin of oleaginousFrench oléagineux from Classical Latin oleaginus from olea, olive tree ( from Classical Greek elaia, olive, olive tree)
- Of or relating to oil.
- Falsely or smugly earnest; unctuous: oleaginous flattery.
Origin of oleaginousFrom Middle English oliaginose and from French oléagineux ( from Old French) both from Latin oleāginus of the olive tree from olea olive tree alteration ( influenced by oleum olive oil ) of olīva ; see olive .
(comparative more oleaginous, superlative most oleaginous)