extramalleolus

lat·er·al mal·le·o·lus

[TA]
the process at the lateral side of the lower end of the fibula, forming the projection of the lateral part of the ankle; the lateral malleolus extends farther inferiorly than the medial malleolus.

extramalleolus

(ĕks″tră-măl-lē′ō-lŭs) [″ + malleolus, little hammer]
The external or lateral malleolus of the ankle.