Definition of soleus
: a broad flat muscle of the calf of the leg lying immediately beneath the gastrocnemius
Medical Definition of soleus
: a broad flat muscle of the calf of the leg that lies deep to the gastrocnemius, arises from the back and upper part of the tibia and fibula and from a tendinous arch between them, inserts by a tendon that unites with that of the gastrocnemius to form the Achilles tendon, and acts to flex the foot
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