pronation

[ proh-ney-shuhn ]

/ proʊˈneɪ ʃən /

rotation of the hand or forearm so that the surface of the palm is facing downward or toward the back (opposed to supination).

a comparable motion of the foot consisting of abduction followed by eversion.

the position assumed as the result of this rotation.

any similar motion of the limbs or feet of animals.

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First recorded in 1660–70; pronate + -ion

Pronation of the forearm is feeble, and is completed by the weight of the hand.
Manual of Surgery|Alexis Thomson and Alexander Miles
The wrist has also forward and backward movements, either in pronation, in supination, or the normal state.
Delsarte System of Oratory|Various
Those defending the upper left-hand quarter are “quarte” (fourth; in supination) and “quinte” (fifth; in pronation).
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5|Various
In disease of the elbow, the usual attitude is that of flexion with pronation of the hand.
Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition.|Alexander Miles

They may follow sudden dorsal flexion, or forced supination, or pronation of the foot.
Surgery, with Special Reference to Podiatry|Maximilian Stern

pronation

[ prō-nā′shən ]

The act of pronating.

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