Definition of "adder"
noun:
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A snake.
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A name loosely applied to various snakes more or less resembling the viper; a viper.
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A small venomous serpent of the genus Vipera. The common European adder is the Vipera berus. The puff adders of Africa are species of the genus Oecobius.
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Any of several small nonvenomous snakes resembling the adder, such as the milk snake.
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The sea-stickleback or adder-fish.
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Someone who or something which performs arithmetic addition.
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Something which adds or increases.
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