The Collaborative International Dictionary of English v.0.48:

Elaeis \E*l[ae]"is\, n. [NL., fr. Gr. ? olive tree.] (Bot.)
   A genus of palms.
   [1913 Webster]

   Note: El[ae]is Guineensis, the African oil palm, is a tree
         twenty or thirty feet high, with immense pinnate leaves
         and large masses of fruit. The berries are rather
         larger than olives, and when boiled in water yield the
         orange-red palm oil.
         [1913 Webster]

WordNet (r) 3.0 (2006):

Elaeis
    n 1: oil palms [syn: Elaeis, genus Elaeis]