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| sill [ sil ] (plural sills) |
noun |
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| Definition: |
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1. window ledge: a ledge below a window, especially one on the inside of a building
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2. bottom of frame: the horizontal part at the bottom of a window or door frame
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3. geology layer of igneous rock: a more or less horizontal layer of igneous rock forced between layers of sedimentary rock or older volcanic beds
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| [ Old English syll "foundation of a wall" < Germanic] |
