peroneus
noun
per·o·ne·us
| \ ˌper-ə-ˈnē-əs
\
\
plural peronei\ -ˈnē-ˌī
\
\
Medical Definition of peroneus
: any of three muscles of the lower leg:
a
: peroneus brevis
b
: peroneus longus
c
: peroneus tertius