̷ ̷ˌ ̷ ̷ ̷ ̷ˈbraŋkēə noun plural
Usage: capitalized
Etymology: New Latin, from opisth- + -branchia
zoology : a large order of Euthyneura comprising marine gastropod mollusks having the gills when present posterior to the heart and having no operculum — compare streptoneura ; see nudibranchia , tectibranchia
• opis·tho·bran·chi·ate ̷ ̷| ̷ ̷ ̷ ̷|braŋkēə̇t, -ēˌāt adjective or noun