noun, plural (especially collectively) lung·fish, (especially referring to two or more kinds or species) lung·fish·es.
Examples from the Web for lungfish
In this Silurian time certain of these lungfish were perhaps trapped in the basin in the marsh by the uplifting of the border.
The lungfish have a curious habit which keeps them over the dry season.
In certain swampy regions these lungfish swim freely in the water of the marshes.
The light from the star that died when the meteor was created fell on Earth before the first lungfish ventured from the sea.All Day September|Roger Kuykendall
His purpose was the study of the wonderful Australian fauna, the oviparous mammals, marsupials, and ceratodus (lungfish).