Definition of oleaginous adjective from the Oxford Advanced Learner's Dictionary

 

oleaginous

 adjective
adjective
BrE BrE//ˌəʊliˈædʒɪnəs//
 
; NAmE NAmE//ˌoʊliˈædʒɪnəs//
 
(formal)
 
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covered in or containing a lot of oil or grease Word Origin late Middle English: from French oléagineux, from Latin oleaginus ‘of the olive tree’, from oleum ‘oil’.
See the Oxford Advanced American Dictionary entry: oleaginous