an unsaturated hydrocarbon, CH, found in shark livers, etc. that is a precursor of cholesterol in biosynthesis
See squalene in American Heritage Dictionary 4
(skwāˈlēnˌ)
noun
A colorless unsaturated aliphatic hydrocarbon, C30H50, found especially in human sebum and in the liver oil of sharks, that is an intermediate in the biosynthesis of cholesterol and is used in biochemical research.