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radula Line breaks: rad¦ula
Pronunciation: /ˈradjʊlə/

Definition of radula in English:

noun (plural radulae ˈradjʊliː)

(In a mollusc) a rasp-like structure of tiny teeth used for scraping food particles off a surface and drawing them into the mouth.
Example sentences
  • Most mollusks use the radula to break up food, but the cone snail uses it to inject venom.
  • In some chitons, the radula has teeth tipped with magnetite, which hardens them.
  • Once the prey is snared it is bitten with strong beak-like jaws and pulled into the mouth by the radula.


Example sentences
  • It is significant that a minority of ammonites and incirrate octopods have radular teeth of this type, or exhibit much size dimorphism.
  • Based on radular and soft-tissue morphology and personal observation of feeding behaviors, it appears that species from both regions feed suctorially with the assistance of a diminutive radula.
  • Major interneurons fire cyclically during feeding in the radular retraction phase of the protraction/retraction cycle and drive many other retraction neurons.


Late 19th century: from Latin, literally 'scraper', from radere 'to scrape'.

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