Buttress

A buttress is a structure placed against the walls of a building to give it more support, or to help it to hold the roofs. Buttresses are common in ancient buildings, especially in Europe. A buttress can be an inside or outside support.

Wikisource has the text of the 1911 Encyclopædia Britannica article Buttress.
buttresses at Sint-Petrus-en-Pauluskerk; Ostend, Belgium
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