Kistvaen n. : A Celtic monument, commonly known as a dolmen.

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Taxonomy
Kistvaen, free encyclopedia, Dartmoor, Celtic saints, cist, scholarship, burial chamber, antiquarian, body, cinerary urn, Brychan, Celtic Christianity, Celtic nations, Drizzlecombe, flat stone, stone slabs, Celts, Christian.

Defination from the web:
kistvaen or cistvaen is a tomb or burial chamber formed from flat stone slabs in a box-like shape. ... When a body was placed in the kistvaen, it was usually lain in a contracted position. Sometimes however the body was cremated with the ashes placed in a cinerary urn. ...