Thanks for using this online dictionary, we have been helping millions of people improve their use of the english language with its free online services. English definition of metastome is as below...

Paragnathus :: Paragnathus (n.) One of the two lobes which form the lower lip, or metastome, of Crustacea..

Metastome :: Metastome (n.) A median elevation behind the mouth in the arthropods.

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