elaeagnus hortensis

from The Collaborative International Dictionary of English v.0.48

Oleaster \O`le*as"ter\, n. [L., fr. olea olive tree. See
   {Olive}, {Oil}.] (Bot.)
   (a) The wild olive tree ({Olea Europea}, var. sylvestris).
   (b) 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.
       [1913 Webster]