EnglishopisthobranchsnounMeaningA gastropod with gills behind the heart, formerly thought to belong to a single group.Related wordsmollusc(English)gastropods(English)molluscs(English)mollusks(English)opisthobranchia(English)opisthosoma(English)brachiopoda(English)elasmobranchii(English)SourcesDictionaryAPI.dev English dictionary data