any of a class of highly unsaturated yellow to red pigments occurring in plants and animals
carotenoid详细解释
ca.rot.e.noid n.（名词）Any of a class of yellow to red pigments, including the carotenes and the xanthophylls.类胡萝卜素：一类黄色至红色的色素，包括胡萝卜素和叶黄素adj.（形容词）Of or relating to such a pigment.类胡萝卜素的，与类胡萝卜素有关的
