Source : Webster's Revised Unabridged Dictionary (1913)

Oleaceous \O`le*a"ceous\, a. [L. ol['e]aceus of the olive tree.]
   (Bot.)
   Of, pertaining to, or resembling, a natural order 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.

Source : WordNet®

Oleaceae
     n : trees and shrubs having berries or drupes or capsules as
         fruits; sometimes placed in the order Oleales: olive;
         ash; jasmine; privet; lilac [syn: {family Oleaceae}, {olive
         family}]