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n.1.(Arch.) A buttress of an arch; the supporter, or that part which joins it to the upright pier.
2.(Masonry) The mass of stone or solid work at the end of a bridge, by which the extreme arches are sustained, or by which the end of a bridge without arches is supported.
Butment cheek
(Carp.) the part of a mortised timber surrounding the mortise, and against which the shoulders of the tenon bear.
- Knight.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.