Ma*drier" (?), n. [F., from Sp.
madero, or Pg. madeiro, fr. Sp. madera wood for
building, timber, Pg. madeira, L. materia stuff,
materials, lumber. See Matter.] A thick plank, used for
several mechanical purposes; especially: (a)
A plank to receive the mouth of a petard, with which it is
applied to anything intended to be broken down.
(b) A plank or beam used for supporting the
earth in mines or fortifications.