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Definition of Sill
1. Noun. Structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure.
2. Noun. (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock.
Definition of Sill
1. 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.
2. n. The shaft or thill of a carriage.
3. n. A young herring.
Definition of Sill
1. Noun. (''also'' '''window sill''') A horizontal slat which forms the base of a window. ¹
2. Noun. A horizontal member bearing the upright portion of a frame. ¹
3. Noun. A horizontal layer of igneous rock between older rock beds. ¹
¹ Source: wiktionary.com
Definition of Sill
1. the horizontal piece that bears the upright portion of a frame [n -S]