What is the full meaning of porpoise
a short-snouted genus of the dolphin family, also PORPESS, PORPESSE [n -S] / to move like a porpoise; specifically (of an aircraft, esp. a seaplane) to touch the water or ground and rise again [v PORPOISED, PORPOISING, PORPOISES]
Example of the word porpoise placed on a Scrabble board.