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

     

    semicircle

     noun
    noun
    BrE BrE//ˈsemisɜːkl//
     
    ; NAmE NAmE//ˈsemisɜːrkl//
     
     
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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.
  4. Word Origin early 16th cent.: from Latin semicirculus (see semi-, circle).
See the Oxford Advanced American Dictionary entry: semicircle