‖Rad″u‐la (răd″ū̍‐lȧ), n.; pl.Radulæ (–lē). [L., a scraper, fr. radere to scrape.] (Zoöl.) The chitinous ribbon bearing the teeth of mollusks; — called also lingual ribbon, and tongue. See Odontophore.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.