malleolus

noun
mal·​le·​o·​lus | \mə-ˈlē-ə-ləs \
plural malleoli\ -​ˌlī \

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

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