GRAY-OUT By N., Pam M.S. - May 11, 2013 the partial loss of consciousness that is due to a lack of oxygen in the blood resulting in hypoxia. Happens to mountain climbers and pilots. Sensory, motor and mental abilities are dulled. GRAY-OUT: "Joe experienced a grey out from the altitude." Related Psychology Terms BLACKOUT PARTIAL SEIZURE BLACKOUT FETAL HYPOXIA ACUTE MOUNTAIN SICKNESS ATARAXY ANOXIA VISUOCONSTRUCTIVE TEST COOPER-HARPER HANDLING QUALITIES RATING SCALE ASTROCYTOSIS Cite this page: N., Pam M.S., "GRAY-OUT," in PsychologyDictionary.org, May 11, 2013, https://psychologydictionary.org/gray-out/ (accessed April 1, 2020).