\But"ment\, n. [Abbreviation of {Abutment}.]
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.