Lungfish (noun)

A freshwater fish of a group that has the ability to breathe air and survive in stagnant or oxygen-poor water.

Origin:

Late 19th century: from lung + fish.

Examples:

1. The lungfish is a species of fish that is well-adapted to life in its environment.
2. The lungfish has a specialized lung that allows it to breathe air and survive in stagnant water.
3. The lungfish is an important food source for many people in Africa.
4. The lungfish is considered a living fossil, as it has remained relatively unchanged for millions of years.
5. The lungfish has an unusual method of reproduction, in which the male guards the eggs until they hatch.