semicircle - definition and synonyms

noun [countable] 

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/ˈsemiˌsɜː(r)k(ə)l/
singularsemicircle
pluralsemicircles
  1. 1
    maths half of a circle
  2. 2
    a group of people or things arranged in a curved line as if they were around the edge of half a circle

    The kids sat in a semicircle around the teacher.