butment

butment is a   Noun

Definition:

[1] A buttress of an arch; the supporter, or that part which joins it to the upright pier.

[2] 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.

Synonyms: