Metastoma Definition
    noun
  
 (zoology) A median elevation behind the mouth in the arthropods.
Wiktionary 
Other Word Forms of Metastoma
Noun
Singular:
 metastomaPlural:
 metastomas, metastomataOrigin of Metastoma
- From Ancient Greek μετά (meta, “behind”) + στόμα (stoma, “mouth”). - From Wiktionary 
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