Cite this Entry
“Supinator.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/supinator. Accessed 4 Jul. 2026.
Copy CitationMedical Definition
supinator
noun
su·pi·na·tor
ˈsü-pə-ˌnāt-ər 
: a muscle that produces the motion of supination
specifically
: a deeply situated muscle of the forearm that arises in two layers from the lateral epicondyle of the humerus and adjacent parts of the ligaments and bones of the elbow and that passes over the head of the radius to insert into its neck and the lateral surface of its shaft
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