sill Hear it!

sill definition

sill (sil)

noun

  1. a heavy, horizontal timber or line of masonry supporting a house wall, etc.
  2. a horizontal piece forming the bottom frame of the opening into which a window or door is set
  3. Geol. a flattened piece of igneous rock forced between beds of stratified rocks

Etymology: ME sille < OE syll, akin to Dan sville, Ger schwelle < IE base *sel-, *swel-, beam, plank > Gr selma, beam

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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