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English word serpent comes from Proto-Indo-European *serp-, and later Latin serpo (I creep, crawl, move slowly.)
*serp- (Proto-Indo-European)
serpo (Latin)
I creep, crawl, move slowly.
serpentem (Latin)
serpent (Old French)
Snake.
serpent (English)
(figurative) A subtle, treacherous, malicious person.. (musical instruments) An obsolete wind instrument in the brass family, whose shape is suggestive of a snake (Wikipedia article).. A kind of firework with a serpentine motion.. A snake. (obsolete) To wind; to encircle.