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From The Collaborative International Dictionary of English v.0.48:
Xyris \Xy"ris\, n. [L., a kind of Iris, Gr. ?, fr. ? a razor.] (Bot.) A genus of endogenous herbs with grassy leaves and small yellow flowers in short, scaly-bracted spikes; yellow-eyed grass. There are about seventeen species in the Atlantic United States. [1913 Webster] Xyst