sem ‧ i ‧ cir ‧ cle /ˈsemiˌsɜːk ə l $ -ɜːr-/ BrE AmE 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
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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