- Word History, Word Explorer
|part of speech:
||a mammal that lives in the ocean. Porpoises look like large fish, but they breathe air. Some kinds of porpoises have a triangular fin on their back. Porpoises are closely related to dolphins and other whales with teeth. Porpoises have a round head with a blunt snout.
||in North America, a name sometimes used for dolphins.
comes from a French word that means "pig fish."