o|le|in

o|le|in «OH lee ihn», noun.

1. the ester of oleic acid and glycerin, one of the most abundant natural fats. Lard, olive oil, and cottonseed oil are mostly olein. Formula: C₅₇H₁₀₄O₆

2. a) the liquid or lower melting portions of any fat. b) = oleic acid. (Cf. ↑oleic acid)

╂[< Latin oleum (olive) oil + English -in]