English
redout
From red + out, because it may cause a red appearance in the visual field; compare blackout.
The story
From red + out, because it may cause a red appearance in the visual field; compare blackout.
Today it means
noun The situation where the body experiences a negative g-force sufficient to cause a blood flow from the lower parts of the body to the head.
Language periods are conventional ranges, not dates for this word.
Etymograph / redout