windowsill

or win·dow sill

[ win-doh-sil ]
/ ˈwɪn doʊˌsɪl /

noun

the sill under a window.

Origin of windowsill

First recorded in 1695–1705; window + sill

Example sentences from the Web for windowsill

British Dictionary definitions for windowsill

windowsill
/ (ˈwɪndəʊˌsɪl) /

noun

a sill below a window