Definition of adder noun from the Oxford Advanced Learner's Dictionary



BrE BrE//ˈædə(r)//
; NAmE NAmE//ˈædər//
Amphibians and reptiles
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a small poisonous snake, often with diamond-shaped marks on its back. Adders are the only poisonous snakes in Britain. See related entries: Amphibians and reptiles Word OriginOld English nædre ‘serpent, adder’, of Germanic origin; related to Dutch adder and German Natter. The initial n was lost in Middle English by wrong division of a naddre; compare with apron and umpire.
See the Oxford Advanced American Dictionary entry: adder

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