An upright stone slab set across the floor of a megalithic chambered tomb to divide it into separate compartments (e.g. in a court cairn). They vary in height from low kerbs to the full height of the chamber; in the latter case they are sometimes provided with port-holes.
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A stone set on its side dividing a megalithic tomb into separate burial areas (see segmented cist). They vary in height from low kerbs to the full height of the chamber; in the latter case they are sometimes provided with port-holes.