Main Entry: white·out

Pronunciation: \ˈhwīt-ˌau̇t, ˈwīt-\

Function: noun

Etymology: white + blackout

Date: 1942

: a surface weather condition in a snow-covered area (as a polar region) in which no object casts a shadow, the horizon cannot be seen, and only dark objects are discernible; also : a blizzard that severely reduces visibility