The Collaborative International Dictionary
Malleolus \Mal*le"*o*lus\, n.; pl. Malleoli. [L., dim. of malleus hammer.]
(Anat.) A projection at the distal end of each bone of the leg at the ankle joint. The malleolus of the tibia is the internal projection, that of the fibula the external.
`` A layer, '' a shoot partly buried in the ground, and there cut halfway through.
Douglas Harper's Etymology Dictionary
bone knob at the ankle, 1690s, from Latin malleolus, diminutive of malleus "a hammer" (see mallet). Anatomical use is said to date to Andreas Vesalius (1514-1564).
Wiktionary
n. The bony prominence on each side of the ankle joint.
Wikipedia
A malleolus is the bony prominence on each side of the human ankle.
Each leg is supported by two bones, the tibia on the inner side (medial) of the leg and the fibula on the outer side (lateral) of the leg. The medial malleolus is the prominence on the inner side of the ankle, formed by the lower end of the tibia. The lateral malleolus is the prominence on the outer side of the ankle, formed by the lower end of the fibula.
Usage examples of "malleolus".
Though well provided by the lots with a quaestor in the person of Gaius Publicius Malleolus, the younger Dolabella insisted upon taking none other than Gaius Verres along as his senior legate.
No slouch, the senior legate Gaius Verres had assessed Malleolus accurately before the party had got as far as Tarentum, and cultivated the quaestor with such charm and winning ways that Malleolus deemed Verres the best of good fellows.
Since he liked Verres, it went hard with Malleolus to go to Dolabella and report what Verres had said, but he did his duty.
Dolabella and Malleolus sighed and shook their heads, unwilling to cause a rift in what was going to be a long and necessarily closely knit association.
Dolabella and Malleolus, the latter now being steadily drawn into a corruption which Verres had already made irresistible to Dolabella.
Verres demanded paper and pen, wrote out the dispositions Gaius Publicius Malleolus dictated, and then assisted him to sign and seal.