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An arched masonry support serving to bear thrust, as from a vaulted ceiling, away from a main structure to an outer pier or buttress. Also called arc-boutant.
(Architecture) a buttress supporting a wall or other structure by an arch or part of an arch that transmits the thrust outwards and downwards. Also called: arc-boutant
an arch or segment of an arch projecting from a wall and transmitting the thrust of a roof or vault outward and downward to a solid buttress or pier.