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From The Collaborative International Dictionary of English v.0.48:
Xylophagan \Xy*loph"a*gan\, n. [See Xylophagous.] (Zool.) (a) One of a tribe of beetles whose larvae bore or live in wood. (b) Any species of Xylophaga. (c) Any one of the Xylophagides. [1913 Webster]