- (n.) The basis or foundation of a thing; especially, a horizontal piece, as a timber, which forms the lower member of a frame or supports a structure; as, the sills of a house, of a bridge, of a loom, and the like.
- (n.) The timber or stone on which a window frame stands; or, the lowest piece in a window frame.
- (n.) A piece of timber across the bottom of a canal lock for the gates to shut against.
- (n.) The floor of a gallery or passage in a mine.
- (n.) A young herring.
- (n.) The timber or stone at the foot of a door; the threshold.
- (n.) The shaft or thill of a carriage.
Webster's Revised Unabridged Dictionary
| APA | Webster's. (2011). sill. Retrieved September 22, 2026, from http://smartdefine.org/sill/definitions/2062067 |
| Chicago | Webster's. 2011. "sill" http://smartdefine.org/sill/definitions/2062067 (accessed September 22, 2026). |
| Harvard | Webster's 2011, sill, Smart Define, viewed 22 September, 2026, <http://smartdefine.org/sill/definitions/2062067>. |
| MLA | Webster's. "sill" 28 May 2011. Web. 22 September 2026. <http://smartdefine.org/sill/definitions/2062067> |