# roofstone

> English word · Noun · IPA /ˈɹuːfˌstəʊ̯n/

## 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.

## Etymology
From roof + stone.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/roofstone