Etymology
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windowsill (n.)

also window-sill, 1703, from window (n.) + sill (n.).

updated on April 06, 2014

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Definitions of windowsill from WordNet

windowsill (n.)
the sill of a window; the horizontal member at the bottom of the window frame;
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.