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From The Collaborative International Dictionary of English v.0.48:
Sash \Sash\, n. [F. ch[^a]ssis a frame, sash, fr. ch[^a]sse a shrine, reliquary, frame, L. capsa. See Case a box.] 1. The framing in which the panes of glass are set in a glazed window or door, including the narrow bars between the panes. [1913 Webster] 2. In a sawmill, the rectangular frame in which the saw is strained and by which it is carried up and down with a reciprocating motion; -- also called gate. [1913 Webster] French sash, a casement swinging on hinges; -- in distinction from a vertical sash sliding up and down. [1913 Webster]