The Collaborative International Dictionary of English v.0.48:

Phylloxanthin \Phyl`lo*xan"thin\, n. [Phyllo- + Gr. xanqo`s
   yellow.] (Bot.)
   A yellow coloring matter extracted from chlorophyll.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

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.
   [1913 Webster]