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xanthophyll
From 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]

