American English

Definition of windowsill noun from the Oxford Advanced American Dictionary

 

windowsill

 noun
noun
NAmE//ˈwɪndoʊˌsɪl//
 
(also sill, window ledge)
 
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a narrow shelf below a window, either inside or outside Place the plants on a sunny windowsill.
See the Oxford Advanced Learner's Dictionary entry: windowsill