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plural brochs
(archaeology) A type of Iron Age stone tower with hollow double-layered walls found on Orkney, Shetland, in the Hebrides and parts of the Scottish mainland. quotations
Finella's carles builded the Kaimes, a long line of battlements under the hills, midway a tower that was older still, a broch from the days of the Pictish men […].
1933, Lewis Grassic Gibbon, Cloud Howe (A Scots Quair), Polygon, published 2006, page 268