malleolus
noun
mal·le·o·lus
| \ mə-ˈlē-ə-ləs
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plural malleoli\ -ˌlī
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Medical Definition of malleolus
: an expanded projection or process at the distal end of the fibula or tibia at the level of the ankle:
a
: the expanded lower end of the fibula situated on the lateral side of the leg at the ankle
— called also external malleolus, lateral malleolus
b
: a strong pyramid-shaped process of the tibia that projects distally on the medial side of its lower end at the ankle
— called also internal malleolus, medial malleolus
c
: a small projection of the tibia on the posterior side of its lower end at the ankle
— called also posterior malleolus