The Collaborative International Dictionary of English v.0.48:

Cholesterin \Cho*les"ter*in\, n. [Gr. ? bile + ? stiff fat: F.
   cholest['e]rine. See Stearin.] (Chem.)
   A white, fatty, crystalline substance, tasteless and
   odorless, found in animal and plant products and tissue, and
   especially in nerve tissue, in the bile, and in gallstones.
   [1913 Webster] Choliamb

WordNet (r) 3.0 (2006):

cholesterin
    n 1: an animal sterol that is normally synthesized by the liver;
         the most abundant steroid in animal tissues [syn:
         cholesterol, cholesterin]