
1) Mollusk tongue 2) Snail tongue
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https://www.crosswordclues.com/clue/radula

The radula (plural radulae or radulas) is an anatomical structure that is used by molluscs for feeding, sometimes compared rather inaccurately to a tongue. It is a minutely toothed, chitinous ribbon, which is typically used for scraping or cutting food before the food enters the oesophagus. The radula is unique to the molluscs, and is found in eve...
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http://en.wikipedia.org/wiki/Radula
[plant] Radula is a genus of liverwort, and is the only genus in family Radulaceae. It contains the following species (but this list could be incomplete): ...
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http://en.wikipedia.org/wiki/Radula_(plant)

• (n.) The chitinous ribbon bearing the teeth of mollusks; -- called also lingual ribbon, and tongue. See Odontophore.
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http://thinkexist.com/dictionary/meaning/radula/

horny, ribbonlike structure found in the mouths of all mollusks except the bivalves. The radula, part of the odontophore, may be protruded, and it is ... [4 related articles]
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http://www.britannica.com/eb/a-z/r/5

A structure found in the mouth of some mollusks which is used to rasp food. The radula consists of a tongue-like strip of horny material (modified epithelium, which bears many rows of chitnous or horny teeth. In slugs and snails, it is used to rasp off pieces of leafy food. In some marine mollusks, ...
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http://www.daviddarling.info/encyclopedia/R/radula.html
Rad'u·la (răd'u*lȧ)
noun ;
plural Radulæ (- lē). [ Latin , a scraper, from
radere to scrape.]
(Zoology) The chitinous ribbon bearing the teeth of mollusks; -- called also
lingual ribbon , and
tongue . See
Odontophore .
Found on
http://www.encyclo.co.uk/webster/R/5

A belt of teeth, found in gastropods and chitons. Used for feeding.
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https://www.encyclo.co.uk/local/20125
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