soleusPronunciation: /sə(ʊ)ˈliːəs/ (also soleus muscle)Definition of soleus noun Anatomy a broad muscle in the lower calf, below the gastrocnemius, which flexes the foot to point the toes downwards. Origin: late 17th century: modern Latin, from Latin solea 'sole'soleus in other Oxford dictionaries Definition of soleus in the US English dictionary