Etymology
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carotenoid (n.)

"carotene-like pigment found in living things," 1913, from German carotinoïde (1911), from carotin (see carotene) + -oid.

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Definitions of carotenoid

carotenoid (n.)
any of a class of highly unsaturated yellow to red pigments occurring in plants and animals;
From wordnet.princeton.edu