, in Architecture, denotes an opening in the wall of a building formed by an arch.
ARC-BOUTANT, is a kind of arched buttress, formed of a flat arch, or part of an arch, abutting against the feet or sides of another arch or vault, to support them and prevent them from bursting or giving way.
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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.
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