from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Any of various venomous snakes of the family Crotalidae, such as a copperhead, rattlesnake, or fer-de-lance, characterized by a small sensory pit below each eye.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of various venomous snakes, of the family Crotalinae, found in Asia and the Americas, with a deep pit or fossa on either side of the head that enables them to detect prey by infrared.

from the GNU version of the Collaborative International Dictionary of English

  • n. any viperine snake having a deep pit on each side of the snout. The rattlesnake and copperhead are examples.

from The Century Dictionary and Cyclopedia

  • n. A venomous serpent of the family Crotalidæ, as a rattlesnake; a pit-headed viper: so called from the characteristic pit between the eyes and the nose. See Bothrophera.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. New World vipers with hollow fangs and a heat-sensitive pit on each side of the head


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