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redout

[red-out] /ˈrɛdˌaʊt/
noun
1.
a condition experienced by pilots and astronauts in which blood is forced to the head and results in a reddening of the field of vision during rapid deceleration or in maneuvers that produce a negative gravity force.
Origin of redout
1940-1945
1940-45; red1 + out, on model of blackout
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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