ˈkāsmənt, older Brit -āzm- noun
( -s )
Etymology: Middle English, probably modification of Old North French encassement frame, from encasser to enchase, frame, from casse case — more at case (box)
1. : a hollow molding similar to a cavetto or scotia
2.
a. : a window sash that opens on hinges fastened to the upright side of the frame
b. or casement window : a window with such a sash or sashes
c. : window
d. : casement cloth