Here you will find one or more explanations in English for the word Metastome.
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Metastome
Metastoma Me*tas"to*ma, Metastome Met"a*stome, n. [NL.
metastoma, from Gr. meta` behind + sto`ma mouth.] (Zo["o]l.)
A median elevation behind the mouth in the arthropods.
Meaning of Metastome from wikipedia