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In the U.S., any of the pit vipers, e.g., the copperhead, cottonmouth (water moccasin), and rattlesnake, of the family Crotalidae, and, in the southern U.S., the coral snakes (genus Micrurus), esp. M. fulvius and M. euryxanthus. Venomous snakes have a worldwide distribution. Specific names of snakes in the general vocabulary are listed under the first word. See: e.g., cobra; copperhead; daboia