Baseboard

[Sarah]

A board, or other woodwork, carried round the walls of a roomand touching the floor, to form a base and protect the plastering; --also called washboard (in England), mopboard, and scrubboard.

[Sarah]

the internets definitive design discussion forum, macintosh technical help board, gallery and community site. ever. honestly.

[Justin Bieber]

a piece of wood fixed along the bottom of a wall where it meets the floor

[Sommer]

A narrow wooden board running along the base of an interior wall.