ETYM Old Eng. porpeys, Old Fren. porpeis, literally, hog fish, from Latin porcus swine + piscis fish. Related to Pork, and Fish.
Any of several small gregarious cetacean mammals having a blunt snout and many teeth.
Any small whale of the family Delphinidae that, unlike dolphins, have blunt snouts without beaks. Common porpoises of the genus Phocaena can grow to 1.8 m/6 ft long; they feed on fish and crustaceans.
1. To leap or plunge like a porpoise
2. To rise and fall repeatedly