supination

[ soo-puh-ney-shuhn ]

/ ˌsu pəˈneɪ ʃən /

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rotation of the hand or forearm so that the palmar surface is facing upward (opposed to pronation).

a comparable motion of the foot, consisting of adduction followed by inversion.

the position assumed as the result of this rotation.

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The rainy weather could not ________ my elated spirits on my graduation day.

First recorded in 1660–70; supinate + -ion

Overpronation wears away the inside edge of the shoe, while supination erodes the outer edge.
Best running shoes for men: Five things to consider|Eric Alt|December 9, 2020|Popular Science
The radius and ulna are parallel in the most natural position of supination.
Gunshot Roentgenograms|Clyde S. Ford
Sem′i-supernat′ural, half-divine and half-human; Sem′i-sū′pinated, placed between supination and pronation.
Chambers's Twentieth Century Dictionary (part 4 of 4: S-Z and supplements)|Various
With the forearm in supination they would appear in their real position, in front of the ulna and on the outside of the radius.
Gunshot Roentgenograms|Clyde S. Ford

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
Those defending the lower right-hand quarter are “octave” (eighth; in supination) and “seconde” (second; in pronation).
Encyclopaedia Britannica, 11th Edition, Volume 10, Slice 5|Various