pronation

[proh-ney-shuhn]
noun
1.
rotation of the hand or forearm so that the surface of the palm is facing downward or toward the back (opposed to supination ).
2.
a comparable motion of the foot consisting of abduction followed by eversion.
3.
the position assumed as the result of this rotation.
4.
any similar motion of the limbs or feet of animals.

Origin:
1660–70; pronate + -ion

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Collins
World English Dictionary
pronate (prəʊˈneɪt)
 
vb
(tr) to turn (a limb, hand, or foot) so that the palm or sole is directed downwards
 
[C19: from Late Latin prōnāre to bend forwards, bow]
 
pro'nation
 
n

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

pronation pro·na·tion (prō-nā'shən)
n.

  1. The act of pronating.

  2. The condition of being pronated, especially the condition of having flat feet.

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
Then run down a short track embedded with a sensor pad that gauges pronation or
  supination and prescribes support remedies.
No rotation is possible, but the effect of rotation is obtained by the
  pronation and supination of the radius on the ulna.
They stand with their knees in rotation and their feet in pronation.
And a wedge of firm foam on the back side of the midsole offers pronation
  support for those who need it.
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