What is "oleaceous"

Oleaceous \O`le*a"ceous\, a. [L. ol['e]aceus of the olive tree.] (Bot.) Of, pertaining to, or resembling, a natural family of plants ( Oleace[ae]), mostly trees and shrubs, of which the olive is the type. It includes also the ash, the lilac, the true jasmine, and fringe tree.

a. Of or pertaining to the plant family Oleaceae.

adj. of or pertaining to or characteristic of trees or shrubs of the olive family