pestle

pestle (http://definr.com/pestle)

     n 1: machine consisting of a heavy bar that moves vertically for
          pounding or crushing ores [syn: stamp]
     2: a heavy tool of stone or iron (usually with a flat base and
        a handle) that is used to grind and mix material (as grain
        or drugs or pigments) against a slab of stone [syn: muller,
         pounder]
     3: a club-shaped hand tool for grinding and mixing substances
        in a mortar
     v : grind or pulverize in a pestle