noun a screw thread having one flank that is vertical while the other is inclined, and a flat top and bottom: used in machine tools and designed to withstand heavy thrust in one direction
any external prop or support built to steady a structure by opposing its outward thrusts, especially a projecting support built into or against the outside of a masonry wall. any prop or support. a thing shaped like a buttress, as a tree trunk with a widening base. a bony or horny protuberance, especially on a […]
the boundary lines of a piece of land, as used in deeds, titles, etc.