radula
noun
a chitinous band in the mouth of most mollusks, set with numerous, minute, horny teeth and drawn backward and forward over the floor of the mouth in the process of breaking up food.
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The former are paired and ventral, and open on a subradular prominence.
From Encyclopaedia Britannica, 11th Edition, Volume 6, Slice 2 "Chicago, University of" to "Chiton" by Various