basemented

adjective2

1. •
   Having a basement.

   • She is a widow, and she owns—mortgaged, of course—one of those old-fashioned, two-and-a-half-story, red-brick basemented houses⸺ — 1902
2. •
   Within a basement.

   • A large, apparently semi-basemented, room (Room 4) was added to the rear of Room 2 in Building B. — 1989