The Collaborative International Dictionary
phylloxanthin
Xanthophyll \Xan"tho*phyll\, n. [Xantho- + Gr. fy`llon leaf.] (Bot.) A yellow coloring matter found in yellow autumn leaves, and also produced artificially from chlorophyll; -- formerly called also phylloxanthin.
Wiktionary
phylloxanthin
n. 1 (context obsolete organic chemistry English) The former name for xanthophyll. 2 (context obsolete organic chemistry English) A yellow pigment obtained by degradation of chlorophyll.