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

      

    beak

     noun
    noun
    BrE BrE//biːk//
     
    ; NAmE NAmE//biːk//
     
    Parts of animals
     
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  1. 1   the hard pointed or curved outer part of a bird’s mouth synonym bill The gull held the fish in its beak. See related entries: Parts of animals
  2. 2(humorous) a person’s nose, especially when it is large and/or pointed
  3. 3(old-fashioned, British English, slang) a person in a position of authority, especially a judge
  4. Word Origin senses 1 to 2 Middle English: from Old French bec, from Latin beccus, of Celtic origin. sense 3 late 18th cent.: probably from criminals' slang.
See the Oxford Advanced American Dictionary entry: beak