Joint"er (?), n. 1. One who, or that which, joints.

2. A plane for smoothing the surfaces of pieces which are to be accurately joined; especially: (a) The longest plane used by a joiner. (b) (Coopering) A long stationary plane, for planing the edges of barrel staves.

3. (Masonry) (a) A bent piece of iron inserted to strengthen the joints of a wall. (b) A tool for pointing the joints in brickwork.