Definition of windowsill in English:

windowsill

Syllabification: win·dow·sill
Pronunciation: /ˈwindōˌsil
 
/
(also window sill)

noun

A ledge or sill forming the bottom part of a window.
More example sentences
  • Well, the caulking would go down here with the window sill, with the frame.
  • Keep a bucket of soapy water and a second sponge to clean the exterior window sill.
  • It is thought he climbed to the window sill and then slipped over the ledge.

Definition of windowsill in:

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Word of the day neoteny
Pronunciation: niːˈɒt(ə)ni
noun
retention of juvenile features in the adult animal