Ad·der, n.
 1. A serpent. [Obs.] “The eddre seide to the woman.”
 2. Zool. (a) A small venomous serpent of the genus Vipera. The common European adder is the Vipera  berus or Pelias berus. The puff adders of Africa are species of Clotho. (b) In America, the term is commonly applied to several harmless snakes, as the milk adder, puffing adder, etc. (c) Same as Sea Adder.
 Note: ☞ In the sculptures the appellation is given to several venomous serpents, -- sometimes to the horned viper (Cerastles).

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 Vipera berus
      n : small terrestrial viper common in northern Eurasia [syn: adder,
           common viper]