n, pl  -li   :  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 malleolus   b  :  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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