Baseboard n. (Arch.) A board, or other woodwork, carried round the walls of a room and touching the floor, to form a base and protect the plastering; also called washboard (in England), mopboard, and scrubboard.
... swept that room—moved every chair, the table, the desk. He dusted each piece of furniture four times. He polished each rung and followed around the baseboard on hands and knees. ... — Little Journeys To The Homes Of Great Teachers • Elbert Hubbard