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The Collaborative International Dictionary of English v.0.48:

Scaphognathite \Sca*phog"na*thite\, n. [Gr. ska`fh boat + gna`qos jaw.] (Zool.) A thin leafike appendage (the exopodite) of the second maxilla of decapod crustaceans. It serves as a pumping organ to draw the water through the gill cavity. [1913 Webster]