The Collaborative International Dictionary of English v.0.48:

Elaeagnus \E`l[ae]*ag"nus\, n. [NL., fr. Gr. ? a B[oe]otian
   marsh plant; ? olive + ? sacred, pure.] (Bot.)
   A genus of shrubs or small trees, having the foliage covered
   with small silvery scales; oleaster.
   [1913 Webster]

WordNet (r) 3.0 (2006):

Elaeagnus
    n 1: oleaster [syn: Elaeagnus, genus Elaeagnus]