Medical Definition of malleolus
plural malleoli \-ˌlī\play
: 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 , 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 , c: a small projection of the tibia on the posterior side of its lower end at the ankle—called also
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