GNU Collaborative International Dictionary of English

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1.       
    Butment , n. [Abbreviation of Abutment.]
   (Arch.) A buttress of an arch; the supporter, or that part which joins it to the upright pier.
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   (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.
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   Butment cheek (Carp.), the part of a mortised timber surrounding the mortise, and against which the shoulders of the tenon bear.
   Knight.
   
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