Definitions
sill Tweet Definition of sill Like Definition of sill on Facebook
noun 
  1. (also window sill) A horizontal slat which forms the base of a window.
She looked out the window resting her elbows on the window sill.
  1. A horizontal member bearing the upright portion of a frame.
  2. A horizontal layer of igneous rock between older rock beds.
Etymology: From Middle English sille, from Old English syll, threshold.


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