Casement

n.

1.

(Arch.) A window sash opening on hinges affixed to the upright side of the frame into which it is fitted. (Poetically) A window. A casement of the great chamber window. - Shak.

Noun

1.

casement - a window shash that is hinged (usually on one side)

bay, bay window, bow window, cadre, case, casement window, casing, chassis, doorframe, fabric, fan window, fanlight, frame, framework, framing, grille, lancet window, lantern, lattice, latticework, light, louver window, oriel, pane, picture frame, picture window, port, porthole, rose window, sash, shell, skeleton, skylight, transom, wicket, window, window bay, window case, window frame, window glass, windowpane