mastabah(n = noun.artifact) mastaba - an ancient Egyptian mud-brick tomb with a rectangular base and sloping sides and flat roof; "the Egyptian pyramids developed from the mastaba"
is a kind of grave, tomb

1.  In Mohammedan countries, a fixed seat, common in dwellings and in public places. [Webster 1913 Suppl.]

2.  A type of tomb, of the time of the Memphite dynasties, comprising an oblong structure with sloping sides (sometimes containing a decorated chamber, sometimes of solid masonry), and connected with a mummy chamber in the rock beneath. [Webster 1913 Suppl.]