Definition of semicircle noun from the Oxford Advanced American Dictionary

     

    semicircle

     noun
    noun
    NAmE//ˈsɛmiˌsərkl//
     
     
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  1. 1(geometry) one half of a circle
  2. 2the line that forms the edge of a semicircle
  3. 3a thing, or a group of people or things, shaped like a semicircle a semicircle of chairs We sat in a semicircle round the fire.
semicircular
 
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NAmE//ˌsɛmiˈsərkyələr//
 
adjective a semicircular driveway
See the Oxford Advanced Learner's Dictionary entry: semicircle