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
Sorry, no etymologies found.