%butment%

n. 1. State of abutting. [ 1913 Webster ]

2. That on or against which a body abuts or presses; as (a) (Arch.) The solid part of a pier or wall, etc., which receives the thrust or lateral pressure of an arch, vault, or strut. Gwilt. (b) (Mech.) A fixed point or surface from which resistance or reaction is obtained, as the cylinder head of a steam engine, the fulcrum of a lever, etc. (c) In breech-loading firearms, the block behind the barrel which receives the pressure due to recoil. [ 1913 Webster ]