opisthobranch
Pronunciation:
/ɵˈpɪsθəbɹæŋk/noun
Definitions
A gastropod with gills behind the heart, formerly thought to belong to a single group.
adjective
Definitions
(of gills) Placed behind the heart.
Antonyms:prosobranch(of a gastropod) Having gills placed behind the heart.
Antonyms:prosobranch