Definition of sharp noun from the Oxford Advanced American Dictionary

     

    sharp

     noun
    noun
    NAmE//ʃɑrp//
     
     
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  1. 1(music) a note played a half step higher than the note that is named. The written symbol is (♯) It's a difficult piece to play, full of sharps and flats. opposite flat, natural
  2. 2 sharps [plural] (medical) things with a sharp edge or point, such as needles and syringes the safe disposal of sharps sharps injuries
See the Oxford Advanced Learner's Dictionary entry: sharp