A viper is a certain type of poisonous snake. The most common vipers in the United States are rattlesnakes and water moccasins.

Vipers are found in most places on earth, although some of the most famous poisonous snakes in the world, for example the cobra, are not vipers. Although viper is a scientific name for a particular family of snakes who poison others by biting them with hollow fangs that inject venom, it is often used generally to describe a spiteful, disloyal or back-stabbing person.

Definitions of viper
  1. noun
    venomous Old World snakes characterized by hollow venom-conducting fangs in the upper jaw
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    Vipera berus, adder, common viper
    small terrestrial viper common in northern Eurasia
    Vipera aspis, asp, asp viper
    of southern Europe; similar to but smaller than the adder
    Bitis arietans, puff adder
    large African viper that inflates its body when alarmed
    Bitis gabonica, gaboon viper
    large heavy-bodied brilliantly marked and extremely venomous west African viper
    Cerastes cornutus, cerastes, horned asp, horned viper, sand viper
    highly venomous viper of northern Africa and southwestern Asia having a horny spine above each eye
    pit viper
    New World vipers with hollow fangs and a heat-sensitive pit on each side of the head
    Agkistrodon contortrix, copperhead
    common coppery brown pit viper of upland eastern United States
    Agkistrodon piscivorus, cottonmouth, cottonmouth moccasin, water moccasin
    venomous semiaquatic snake of swamps in southern United States
    rattler, rattlesnake
    pit viper with horny segments at the end of the tail that rattle when shaken
    Bothrops atrops, fer-de-lance
    large extremely venomous pit viper of Central America and South America
    type of:
    ophidian, serpent, snake
    limbless scaly elongate reptile; some are venomous
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