hence

a rib (as curved), literally (of the body) or figuratively (of a door, i.e. leaf); hence, a side, literally (of a person) or figuratively (of an object or the sky, i.e. quarter); architecturally, a (especially floor or ceiling) timber or plank (single or collective, i.e. a flooring)

beam, board, chamber, corner, leaf, plank, rib, side (chamber).