noun (plural -branchs) see: epi- Date: circa 1856 any of a subclass (Opisthobranchia) of marine gastropod mollusks that have the gills when present posterior to the heart and often lack a shell, ~ adjective
OPISTHOBRANCH
Meaning of OPISTHOBRANCH in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012