Medical Definition of malleolus
plural mal·le·o·li \-ˌlī\play
: an expanded projection or process at the distal extremity of each bone of the leg:a: the expanded lower extremity of the fibula situated on the lateral side of the leg at the ankle—called also external malleolus, lateral malleolusb: a strong pyramid-shaped process of the tibia that projects distally on the medial side of its lower extremity at the ankle—called also internal malleolus, medial malleolus
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