noun Biochemistry.
Also called xanthophyll. a yellow-red, water-insoluble, crystalline, carotenoid alcohol, C 40 H 56 O 2 , 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.
a preparation consisting of dried and powdered corpora lutea from hogs.

1865–70; < Latin lūte(um) yolk of an egg (noun use of neuter of lūteus yellow; see luteous) + -in2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lutein (ˈluːtɪɪn)
a xanthophyll pigment, occurring in plants, that has a light-absorbing function in photosynthesis
[C20: from Latin lūteus yellow + -in]

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American Heritage
Medical Dictionary

lutein lu·te·in (lōō'tē-ĭn, -tēn')

  1. A yellow carotenoid pigment found widely in nature; xanthophyll.

  2. A dried preparation of corpus luteum.

The American Heritage® Stedman's Medical Dictionary
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Example sentences
Likewise, popcorn contains lutein, a micronutrient that also has anti-inflammatory characteristics.
Lutein, a common plant pigment, has been strongly implicated as being protective certain eye diseases.
Lutein is a vitamin which is known to provide pigment to the eye.
Lutein is one of the hydroxy carotenoids that make up the macular pigment of human retinas.
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