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semicircle

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semicircle
semicircle /ˈsemiˌsɜːkəl $ -ɜːr-/ noun [countable]
 Word Family: noun: circle, semicircle, circulation; adjective: circular, semicircular, circulatory; verb: circle, circulate
half a circle
    in a semicircle
    About 50 children sat in a semicircle around me.
—semicircular /ˌsemiˈsɜːkjələ◂, ˌsemiˈsɜːkjʊlə◂ $ -ˈsɜːrkjələr◂/ adjective
     
THESAURUS
■ types of shapes
    square a shape with four straight sides that are equal in length and four angles of 90 degrees
    circle a round shape that is like an O
    semicircle half a circle
    triangle a shape with three straight sides and three angles
    rectangle a shape with four straight sides and four angles of 90 degrees
    oval a shape like a circle, but that is longer than it is wide
    cylinder an object in the shape of a tube
    cube a solid object with six equal square sides
    pyramid a shape with a square base and four triangular sides that meet in a point at the top
    sphere a shape like a ball