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Definition of serpent
chiefly literary a large snake.
(the Serpent) a biblical name for Satan (see Gen. 3, Rev. 20). a dragon or other mythical snakelike reptile. 2a sly or treacherous person, especially one who exploits a position of trust in order to betray it. 3 historical a bass wind instrument made of leather-covered wood in three U-shaped turns, with a cup-shaped mouthpiece and few keys. It was played in military and church bands from the 17th to 19th centuries.