Definitions from Wiktionary ( )

▸ noun:  (architecture, also "window sill") A breast wall; window breast; horizontal brink which forms the base of a window.
▸ noun:  (construction) A 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.
▸ noun:  (geology) A stratum of rock, especially an intrusive layer of igneous rock lying parallel to surrounding strata.
▸ noun:  A threshold or brink across the bottom of a canal lock for the gates to shut against.
▸ noun:  (anatomy) A raised area at the base of the nasal aperture in the skull.
▸ noun:  (military, historical) The inner edge of the bottom of an embrasure.
▸ noun:  (UK) A young herring.
▸ noun:  The shaft or thill of a carriage.
▸ adjective:  (rare, slang) Silly.
▸ noun:  A surname.

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