Horn

Also called sill horn

The end of a sill or stool that extends past the side casings.

Horns are the short ends of a sill or stool that project sideways beyond the casings on either side of the window. On the sill they let the ledge overhang the wall trim; on the stool they let it sit flush over the wall.

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Double-hung window, from outside

SillThe bottom member of the window frame, sloped outward to shed water.
StoolThe interior ledge at the bottom of the window.

Horn

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