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roofstone

Pronunciation: /ˈɹuːfˌstəʊ̯n/

The English word “roofstone” has 2 meanings listed here.

noun

  1. The stone or rock layer immediately above a coal seam.
  2. A large, usually flat stone slab placed atop the side-stones (orthostats) of a megalithic burial chamber—such as in portal tombs, wedge tombs, or gallery graves—to form a roof covering the interior space.

Etymology

From roof + stone.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.