muller(n = noun.artifact) pestle, pounder - 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;
A vessel in which wine, etc., is mulled over a fire. [1913 Webster]
Muller, n. [OE. mullen to pulverize, bruise; cf. Icel. mylja; prob. akin to E. mold soil. See Mold soil, and cf. Mull dirt.].
A stone or thick lump of glass, or kind of pestle, flat at the bottom, used for grinding pigments or drugs, etc., upon a slab of similar material. [1913 Webster]