OLEAGINOUS Meaning of OLEAGINOUS in English [ ˌəʊlɪ'adʒɪnəs ]■ adjective1》 oily or greasy. 2》 exaggeratedly complimentary; obsequious.OriginME: from Fr. oléagineux , from L. oleaginus 'of the olive tree'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004