Definition of “sill”
noun:
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A horizontal slat which forms the base of a window.
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A horizontal, structural member of a building near ground level on a foundation (sense #3) or pilings or lying on the ground in earth-fast construction and bearing the upright portion of a frame. Also spelled cill. Also called a ground plate, groundsill, sole, sole-plate, mudsill. An interrupted-sill fits between posts instead of being below and supporting the posts in timber framing.
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A horizontal layer of igneous rock between older rock beds.
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A young herring.
from Wiktionary, Creative Commons Attribution/Share-Alike License
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