Casement window

A casement window is a window that is attached to its frame by one or more hinges at the side. They are used singly or in pairs within a common frame, in which case they are hinged on the outside. Casement windows are often held open using a casement stay.

Windows hinged at the top are referred to as awning windows, and ones hinged at the bottom are called hoppers.

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Source: Wikipedia · Image: Wikimedia Commons · Public domain

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