society > inhabiting and dwelling > inhabited place > a building > parts of building > room > types of room by situation > [noun] > room on ground floor
ground-chamber1638
ground room1662
1638 T. HerbertSome Yeares Trav. (rev. ed.) 169 The ground chambers were large.
1886 R. Willis & J. W. ClarkArchit. Hist. Univ. Cambr. I. 223 The first floor, as usual, overhangs the ground-chamber.