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plural semi-circles
Alternative spelling of semicircle quotations examples
Below is the deep abyss of the Lauterbrunnen valley, and at its head a stately semi-circle of mountains, with the pyramidal Lauterbrunnen Breithorn as the centre-piece.
1960 December, Voyageur, “The Mountain Railways of the Bernese Oberland”, in Trains Illustrated, page 752