peroneus

noun
per·​o·​ne·​us | \ˌper-ə-ˈnē-əs \
plural -nei\ -​ˈnē-​ˌī \

Medical Definition of peroneus 

: any of three muscles of the lower leg:

a : peroneus brevis

b : peroneus longus

c : peroneus tertius

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