pit' vi"per

any of numerous venomous snakes of the family Crotalidae, of the New World, Asia, and the Malay Archipelago, as the rattlesnake, water moccasin, and copperhead, having a heat-sensitive pit on each side of the head between the eye and nostril.

Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.

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