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windowsill

noun [C]
 
 
/ˈwɪn.dəʊ.sɪl/ US  /-doʊ-/ (also window ledge)

Definition

a shelf below a window, either inside or outside a building: He's got a few plants in pots on the windowsill.Windows and parts of windows
(Definition of windowsill noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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