semicircular
adjective/ˌsemiˈsɜːkjələ(r)/
/ˌsemiˈsɜːrkjələr/, /ˌsemaɪˈsɜːrkjələr/
- forming or having a shape like one half of a circle
- a semicircular driveway
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semicircular
Definition of semicircular adjective from the Oxford Advanced Learner's Dictionary