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pro·na·tor / ˈprōˌnātər/ • n. Anat. 1. a muscle whose contraction produces or assists in the pronation of a limb or part of a limb. ∎  any of several specific muscles in the forearm. 2. one who pronates when walking or running.

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pronator (proh-nay-ter) n. any muscle that causes pronation of the forearm and hand.

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