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n. Any of a class of yellow to red pigments, including the carotenes and the xanthophylls.

adj. Of or relating to such a pigment.

n. Any of a class of yellow to red plant pigments including the carotenes and xanthophylls.

adj. Of, or relating to such a class of pigments.

n. any of a class of highly unsaturated yellow to red pigments occurring in plants and animals

"It starts with shorter days, which triggers a whole series of processes, says Ed Hedborn, a botanist who manages plant records at the Morton Arboretum outside Chicago in Lisle, Ill. With less daylight, trees and other plants stop making chlorophyll, whose absence unmasks the yellow, orange and brown hues of the pigment carotenoid, which is always in the leaves, but hidden by the green."

phytochemical    antioxidant    pigment   

astaxanthin    alpha-carotene    capsorubin    capsanthin    chrysanthemaxanthin   

zeaxanthin    xanthophyll    lycopene    xanthophyl    lutein   

polyphenolic    pearlescent    costimulatory    light-sensitive    anthocyanin