\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 plaining 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.