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sill
 
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
silky elm silky oak silky pocket mouse silky tamarin silky terrier silky willow silky wisteria sill, sill silla sillabub sillaginidae sillago sillhouette sillier silliest silliloqy

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