From Longman Dictionary of Contemporary Englishadderad‧der /ˈædə $ -ər/ noun [countable] HBAa type of poisonous snake
Examples from the Corpus
adder• Even a broken worm can kill, if it happens to be an adder.• The deaf adder of appetite Coiled under.• As quick as a striking adder, the soldier's fingers fastened around her arm.• During the summer, adders can often be found basking in the morning sunshine.• The adder is uniquely equipped for that role.Origin adder (1300-1400) a nadder, mistaken for an adder; nadder “adder” ((11-17 centuries)) from Old English næddre 