nounpl. (see fish) -·fish·, -·fish·es
any of two orders (Ceratodiformes and Lepidosireniformes) of lobefins having lungs as well as gills
nounpl. lungfish, or lung·fish·es
Any of several freshwater lobe-finned fishes of the group Dipnoi of Africa, South America, and Australia, having a lunglike organ that enables them to breathe air, especially during drought conditions.
(plural lungfish or lungfishes)