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Use "voussoirs" in a sentence
"An arch consists of a series of wedge shaped blocks, known as voussoirs, arranged in a curve, and so locking one another together that unless the abutments from which the arch springs give way, it will not only carry itself, but sustain a heavy load."
"The separate stones which compose the curve of an arch are called voussoirs, or arch-stones."
"Then I repented, since only by throwing myself sideways along her neck did I avoid the voussoirs of the arch as she crashed underneath in half-terror of this strange place."