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  • noun

Words related to sill

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

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References in periodicals archive ?
If only the manufacturers and installers had used a wider window cill, just another 50mm (2in) wider would do, then this problem wouldn't occur.
The properties have slate roofs, stone heads and cills, traditional chimneys and sliding sash windows.
If you include symmetrical bays to east and west, and projecting cills (for sculpture) north and south, the plan is a perfect square.
Conventional arrangements of office furniture and meeting rooms were felt by the client to be inappropriate and it quickly became clear to the architects that staff preferred to 'perch on window cills, lie on tables, crouch on the floor -- anything rather than sit at tables in orderly fashion'.