Definitions
1.NounA breast wall; window breast; horizontal brink which forms the base of a window."She looked out the window resting her elbows on the window sill."
2.NounA threshold; horizontal structural member of a building near ground level on a foundation or pilings, or lying on the ground, and bearing the upright portion of a frame; a sill plate.
3.NounA stratum of rock, especially an intrusive layer of igneous rock lying parallel to surrounding strata.
4.NounA threshold or brink across the bottom of a canal lock for the gates to shut against.
5.NounA raised area at the base of the nasal aperture in the skull."the nasal sill"
6.NounThe inner edge of the bottom of an embrasure.
7.NounA young herring.
8.NounThe shaft or thill of a carriage.
9.AdjectiveSilly.