a sea mammal that lives in oceans and other salt or fresh water, has a streamlined body, a long snout, and a curved dorsal fin, and is closely related to whales and porpoises.
A dolphin jumped high out of the water near the boat.
The trainer fed fish to the dolphin at the aquarium.
✦ From Old French 'dauphin' (originally meaning 'delphin'), from Latin 'delphinus', from Ancient Greek 'delphis' (δελφίς), from Proto-Indo-European roots related to fish.
