Architecture, Civil Engineering. a masonry mass supporting and receiving the thrust of part of an arch or vault. a force that serves to abut an arch or vault. a mass, as of masonry, receiving the arch, beam, truss, etc., at each end of a bridge. a mass or structure for resisting the pressure of water on a bridge, pier, or the like. each of the parts of a canyon or the like receiving the thrusts of an arch dam. a structure for absorbing tensions from reinforcing strands for concrete being prestressed.
the place where projecting parts meet; junction.
Dentistry. a tooth or tooth root that supports or stabilizes a bridge, denture, or other prosthetic appliance.
the state or process of abutting
something that abuts the thing on which something abuts the point of junction between them