- a small Roman fortlet or tower, a diminutive of castrum ("military camp"), often used as a watchtower or signal station like on Hadrian's Wall. It should be distinguished from a burgus, which was a later Latin term that was used particularly in the Germanic provinces.
- a settling or storage tank in a Roman aqueduct or it:castellum aquae.
- Charlton T. Lewis, Charles Short, A Latin Dictionary
- C. Julius Caesar, Gallic War; 2,30
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