Definitions from Wiktionary (metastoma)

▸ noun:  (zoology) A median elevation behind the mouth in the arthropods.
▸ noun:  (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.
▸ noun:  (botany) A structure found in some mosses and liverworts that covers the mouth of the capsule from which spores are released.



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