radula

From ZooTerms (Dictionary of Invertebrate Zoology)
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radula (noun; plural radulae; Latin radula, scrape): 1. (Arthropoda: Insecta) The raster.

2. (Mollusca) A uniquely molluscan feeding rasplike organ, odontophore or lingual ribbon, armed with chitinous denticles, found in nearly all mollusks, except clams.