casement

ikkuna A window sash that is hinged on the side and opens outward.
A window having such sashes; a casement window.(w)
1873, (w), s:The City of Dreadful Night|The City of Dreadful Night

The street-lamps always burn; but scarce a casement / In house or palace front from roof to basement / Doth glow or gleam athwart the mirk air cast.

The house was a big elaborate limestone affair, evidently new. Winter sunshine sparkled on lace-hung casement, on glass marquise, and the burnished bronze foliations of grille and door.