English

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

     

    loon

     noun
    noun
    BrE BrE//luːn//
     
    ; NAmE NAmE//luːn//
     
    Birds
     
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  1. 1 a large N American bird that eats fish and has a cry like a laugh See related entries: Birds
  2. 2= loony That guy’s a real loon.
  3. Word Origin sense 2 late 19th cent.: from loon (referring to the bird's actions when escaping from danger), perhaps influenced by loony. sense 1 mid 17th cent.: probably by alteration of Shetland dialect loom, denoting especially a guillemot or a diver, from Old Norse.
See the Oxford Advanced American Dictionary entry: loon

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