redout


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red·out

 (rĕd′out′)
n.
A sudden reddening of the visual field accompanied by severe headache and caused by engorgement of the blood vessels of the head when a person is subjected to a negative force of gravity, as in stunt flying.

redout

(ˈrɛdˌaʊt)
n
reddened vision and other symptoms caused by a rush of blood to the head in response to negative gravitational stresses

red•out

(ˈrɛdˌaʊt)

n.
a condition experienced by pilots and astronauts in which rapid deceleration or a negative gravity force drives blood to the head, reddening the field of vision.
[1940–45; on the model of blackout]
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