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Noun: semicircle  'se,mI,sur-kul or 'se-mee,sur-kul [N. Amer], 'se-mee,sur-kul [Brit]
  1. A plane figure with the shape of half a circle
    "The students sat in a semicircle around the teacher";
    - hemicycle

Derived forms: semicircles

Type of: plane figure, two-dimensional figure

Encyclopedia: Semicircle