Meaning of sill

sill

Pronunciation: (sil), [key]
— n.
  1. a horizontal timber, block, or the like serving as a foundation of a wall, house, etc.
  2. the horizontal piece or member beneath a window, door, or other opening. See diag. under
  3. a tabular body of intrusive igneous rock, ordinarily between beds of sedimentary rocks or layers of volcanic ejecta.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.
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