mal·le·o·lus 
(mə-lēə-ləs)
(mə-lēə-ləs)n. pl. mal·le·o·li (-lī′)
Either of the two rounded protuberances on each side of the ankle, the inner formed by a projection of the tibia and the outer by a projection of the fibula.
[New Latin, from Latin, diminutive of malleus, hammer; see melə- in the Appendix of Indo-European roots.]
mal·leo·lar (-ə-lər) adj.