名詞 casement:

1. a window sash that is hinged (usually on one side)

1. A casement is a window that opened by means of hinge at the side.
   豎鉸鏈窗是一種用邊上的鉸鏈開啟的窗戶。
2. There are two casements in this room.
   這間屋子有兩扇窗戶。

case.ment

n.（名詞）

A window sash that opens outward by means of hinges.
窗框：通過折葉向外開的窗框
A window with such sashes.
窗子：帶有這樣窗框的窗戶
A case or covering.
盒子，蓋子

來源：
Middle English [a hollow molding]
中古英語 [一個空心的鑄造物]
possibly from Middle English case [chest, frame] * see case 2
可能源自 中古英語 case [盒子，框架] *參見 case2

【引伸】
case.mented
adj.（形容詞）