Source : Webster's Revised Unabridged Dictionary (1913)

Olein \O"le*in\, n. [L. oleum oil: cf. F. ol['e]ine.] (Physiol.
   Chem.)
   A fat, liquid at ordinary temperatures, but solidifying at
   temperatures below 0[deg] C., found abundantly in both the
   animal and vegetable kingdoms (see {Palmitin}). It dissolves
   solid fats, especially at 30-40[deg] C. Chemically, olein is
   a glyceride of oleic acid; and, as three molecules of the
   acid are united to one molecule of glyceryl to form the fat,
   it is technically known as {triolein}. It is also called
   {elain}.

Source : WordNet®

olein
     n : a naturally occuring glyceride of oleic acid that is found
         in fats and oils [syn: {triolein}]