peroneus longus
noun
peroneus lon·gus
| \ -ˈlȯŋ-gəs
\
\
Medical Definition of peroneus longus
: a peroneus muscle that arises especially from the head and side of the fibula, ends in a long tendon that inserts on the side of the first metatarsal bone and the cuneiform bone on the medial side, and aids in everting and pronating the foot