[proh-ney-ter, proh-ney-]
Anatomy, Zoology. any of several muscles that permit pronation of the hand, forelimb, or foot.

1720–30; pronate + -or2 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
pronator (prəʊˈneɪtə)
any muscle whose contractions produce or affect pronation

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

pronator pro·na·tor (prō'nā'tər)
A muscle that effects or assists in pronation.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
It's super-padded but still keeps the mild pronator in line.
Sheets had flexor tendon surgery as planned and his pronator tendon also was fixed.
He was shut down late in the year with a flexor pronator muscle strain in his right elbow but did not require surgery.
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