olein
/ˈəʊlɪɪn/(also oleine) Chemistry
noun
A glyceryl ester of oleic acid; specifically glyceryl trioleate, C3H5(C18H33O2)3, a colourless oily liquid which is a very common natural fat (also called triolein). Also (more widely): any liquid fat (consisting chiefly of such esters) separated from a solid or semi-solid fat; (formerly, also) †a glyceride of a fatty acid other than oleic acid ( obsolete ).
Origin
Mid 19th century; earliest use found in Thomas Thomson. From French oléine from classical Latin oleum oil + French -ine; compare -in.