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Noun sill has 2 senses
  1. sill - structural member consisting of a continuous horizontal timber forming the lowest member of a framework or supporting structure
    --1 is a kind of
    structural member
    --1 has particulars: doorsill, doorstep, threshold; windowsill
  2. sill - (geology) a flat (usually horizontal) mass of igneous rock between two layers of older sedimentary rock
    --2 is a kind of
    rock, stone
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