Definition of malleus

• n. - 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.
• n. - One of the hard lateral pieces of the mastax of Rotifera. See Mastax.
• n. - A genus of bivalve shells; the hammer shell.