Windowsill Definition

wĭndō-sĭl
windowsills
noun
The horizontal member at the base of a window opening.
American Heritage
The sill of a window.
Webster's New World

The horizontal member protruding from the base of a window frame.

Wiktionary
Synonyms:

Other Word Forms of Windowsill

Noun

Singular:
windowsill
Plural:
windowsills

Origin of Windowsill

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windowsill