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English definition of “semicircular”

semicircular

adjective /sem.iˈsɜː.kju.lər/ us  /sem.iˈsɜː.kju.lər/
shaped liked a half circle: The chairs were placed in a semicircular arrangement. Fluid moves in the semicircular canals within the bony labyrinth of the inner ear.
(Definition of semicircular from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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