Meaning of roofstone | Babel Free

Definitions

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.

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.”

CEFR level