Oleaster n. : The wild olive tree (Olea Europea, var. sylvestris).

Oleaster n. : Any species of the genus Elaeagus. See Eleagnus. The small silvery berries of the common species (Elaeagnus hortensis) are called Trebizond dates, and are made into cakes by the Arabs.

Example:


Taxonomy
C. Y. Chang, southern China, Elaeagnus, species, Silverberry, Rehd, Thunb, eastern Asia, free encyclopedia, Oleaster, Elaeagnus commutata, genus, Elaeagnus species, plants, fruit, Several species, Elaeagnus umbellata, E. angustifolia.

Defination from the web:
... (pronounced /ˌɛliːˈæɡnəs/),[1] known as Silverberry or Oleaster, is a genus of about 50–70 species of flowering plants ... Elaeagnus angustifolia L. (Oleaster, Russian Silverberry or Russian-olive; western Asia). Elaeagnus argyi Levl. ( China) Elaeagnus bambusetorum Hand.-Mazz. ...