Xanthophyll n. : A yellow coloring matter found in yellow autumn leaves, and also produced artificially from chlorophyll; -- formerly called also phylloxanthin.

Example:
How do the functions of carotene and Xanthophyll differ in photosynthesis?

Taxonomy
xanthophylls, carotenes, xanthophyll cycle, free encyclopedia, antheraxanthin, pigment, hydrogen atoms, carotenoid, energy dissipation, enzymatic, proteins, zeaxanthin epoxidase, Jeffrey, C40, yellow pigments, food intake, diadinoxanthin, diatoxanthin.

Defination from the web:
Xanthophylls (originally phylloxanthins) are yellow pigments from the carotenoid group. ... In diatoms and dinoflagellates the xanthophyll cycle consists of the pigment diadinoxanthin, which is transformed into diatoxanthin (diatoms) or ...