Roofstone
noun ·Rare ·Advanced level
Definitions
- 1 The stone or rock layer immediately above a coal seam.
"The intention of the props is for the security of the workmen to keep up the roofstone; they have no effect in resisting the crush of the super-incumbent strata."
- 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.
Example
More examples"The intention of the props is for the security of the workmen to keep up the roofstone; they have no effect in resisting the crush of the super-incumbent strata."
Etymology
From roof + stone.
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.