Malleus /(?)/

pl. Mallei

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. (Anat.)
2. One of the hard lateral pieces of the mastax of Rotifera. See Mastax. (Zool.)
3. A genus of bivalve shells; the hammer shell. (Zool.)