From this central block rose the twin towers, ancient, crenelated, and pierced with many loopholes.
Arthur Conan Doyle. Sherlock Holmes: The Hound of the Baskervilles (1902)
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Great crenellated ramparts, cyclopean, superb, follow the curve of the cliff. On the landward side they are interrupted by a gate-tower resting on one of the most nobly decorated of the horseshoe arches that break the mighty walls of Moroccan cities.
Edith Wharton. In Morocco (1920)
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the crenulated imprint left by the band of her shorts