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WordNet
display window

n. a window of a store facing onto the street; used to display merchandise for sale in the store [syn: shopwindow, show window]

Wikipedia
Display window

A display window, also shop window ( British English) or store window ( American English), is a window in a shop displaying items for sale or otherwise designed to attract customers to the store. Usually, the term refers to larger windows in the front façade of the shop.