1) Archaeology of death 
A kistvaen or cistvaen is a tomb or burial chamber formed from flat stone slabs in a box-like shape. If set completely underground, it may be covered by a tumulus. The word is derived from the Welsh cist (chest) and maen (stone). The term originated in relation to Celtic structures, typically pre-Christian, but in antiquarian scholarship of the 19...
tomb covered with stone slabs
• (n.) A Celtic monument, commonly known as a dolmen.
Kist'vaen (kĭst'vān) noun [ W. cist-faen .] (Archæol.) A Celtic monument, commonly known as a dolmen .