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redout

 - 3 dictionary results

red⋅out

[red-out]
–noun
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:
1940–45; red 1 + out, on model of blackout
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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red·out   (rěd'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.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: red·out
Pronunciation: 'red-"aut
Function: noun
: a condition in which centripetal acceleration (as that created when an aircraft abruptlyenters a dive) drives blood to the head and causes reddening of the visual field and headache —compare BLACKOUT, GRAYOUT
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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