Malleus

Part of speech: noun (n.)

1. The outermost of the three small auditory bones, ossicles; the hammer. It is attached to the tympanic membrane by a long process, the handle or manubrium. See Illust. of Far.

2. One of the hard lateral pieces of the mastax of Rotifera. See Mastax.

3. A genus of bivalve shells; the hammer shell.