oleaceous

[oh-lee-ey-shuh s] /ˌoʊ liˈeɪ ʃəs/
adjective
1.
belonging to the Oleaceae, the olive family of plants.
Compare olive family.
Origin
1855-60; < Neo-Latin Oleace(ae) (Ole(a) the olive genus (Latin olea, olīva olive, olive tree; see olive, oil) + -aceae -aceae) + -ous
British Dictionary definitions for oleaceous

oleaceous

/ˌəʊlɪˈeɪʃəs/
adjective
1.
of, relating to, or belonging to the Oleaceae, a family of trees and shrubs, including the ash, jasmine, privet, lilac, and olive
Word Origin
C19: via New Latin from Latin oleaolive; see also oil