butment

n. [ Abbreviation of Abutment. ] 1. (Arch.) A buttress of an arch; the supporter, or that part which joins it to the upright pier. [ 1913 Webster ]

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. [ 1913 Webster ]

Butment cheek (Carp.), the part of a mortised timber surrounding the mortise, and against which the shoulders of the tenon bear. Knight. [ 1913 Webster ]