We don't have synonyms for metastoma yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are melastoma, metasoma and metastome.
(n) :
(zoology) A median elevation behind the mouth in the arthropods.
(n) :
(zoology) A ventral single plate located in the opisthosoma of some non-arachnid chelicerates in the extinct genus Houia which is involved in feeding and manipulating food.
(n) :
(botany) A structure found in some mosses and liverworts that covers the mouth of the capsule from which spores are released.
(n) :
(zoology) A median elevation behind the mouth in the arthropods.
(n) :
(zoology) A ventral single plate located in the opisthosoma of some non-arachnid chelicerates in the extinct genus Houia which is involved in feeding and manipulating food.
(n) :
(botany) A structure found in some mosses and liverworts that covers the mouth of the capsule from which spores are released.