n. 齿舌

Radula \Rad"u*la\ (r[a^]d"[-u]*l[.a]), n.; pl. {Radul[ae]}
(r[a^]d"[-u]*l[=e]). [L., a scraper, fr. radere to scrape.]
(Zo["o]l.)
The chitinous ribbon bearing the teeth of mollusks; -- called
also {lingual ribbon}, and {tongue}. See {Odontophore}.