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sill
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As a noun, sill means a breast wall.
Meanings of sill
11 meaningsnoun
architecturealso "window sill"A 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.”
constructionA 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.
geologyA stratum of rock, especially an intrusive layer of igneous rock lying parallel to surrounding strata.
A threshold or brink across the bottom of a canal lock for the gates to shut against.
anatomyA raised area at the base of the nasal aperture in the skull.
“the nasal sill”
UKA young herring.
The shaft or thill of a carriage.
Structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
(geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock
Older and rare meanings (1)
militaryhistoricalThe inner edge of the bottom of an embrasure.
adjective
rareslangSilly.
Meanings from Wiktionary (CC BY-SA 4.0) and Open English WordNet (CC BY 4.0).