Pronunciation: (lOO'tē-in),[key] —n.Biochem. 1. Also called xanthophyll. a yellow-red, water-insoluble, crystalline, carotenoid alcohol, C40H56O2, found in the petals of marigold and certain other flowers, egg yolk, algae, and corpora lutea: used chiefly in the biochemical study of the carotenoids.
2. a preparation consisting of dried and powdered corpora lutea from hogs.