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supinator muscle

(sōōpə-nā′tər)
n.
  1. A muscle with origin from the humerus and the ulna, with insertion into the radius, with nerve supply from the radial nerve, and whose action supinates the forearm.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.