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



    BrE BrE//kwæk//
    ; NAmE NAmE//kwæk//
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  1. 1the sound that a duck makes More Like This Animal sounds baa, caw, coo, meow, moo, neigh, oink, quack, tu-whit, tu- whoo, tweet, woofSee worksheet.
  2. 2(informal, disapproving) a person who dishonestly claims to have medical knowledge or skills quack doctors I've got a check-up with the quack (= the doctor) next week.
  3. Word Originnoun sense 1 mid 16th cent. (as a verb): imitative. noun sense 2 mid 17th cent.: abbreviation of earlier quacksalver, from Dutch, probably from obsolete quacken ‘prattle’ + salf, zalf (see salve).
See the Oxford Advanced American Dictionary entry: quack

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