D defs.my
Entry 1 sense Webster, 1913

Casement

· Case·ment · IPA
01 n. A window sash opening on hinges affixed to the upright side of the frame into which it is fitted. (Poetically) A window.
  1. 1.
    A window sash opening on hinges affixed to the upright side of the frame into which it is fitted. (Poetically) A window.(Arch.) (Poetically)
    “A casement of the great chamber window.” Shak.