Source : Webster's Revised Unabridged Dictionary (1913)

Lutein \Lu"te*in\, n. [From corpus luteum.] (Physiol. Chem.)
   A substance of a strongly marked yellow color, extracted from
   the yelk of eggs, and from the tissue of the corpus luteum.

Source : WordNet®

lutein
     n : yellow carotenoid pigments in plants and animal fats and egg
         yolks [syn: {xanthophyll}, {xanthophyl}]