| doorsill | (noun) the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway | Synonyms: doorstep, threshold |
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| sill | (noun) structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure | - |
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| (noun) (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock | - |
| windowsill | (noun) the sill of a window; the horizontal member at the bottom of the window frame | - |
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