ˈ ̷ ̷ˌ ̷ ̷ noun
: light that is observed especially during the night, that originates in the high atmosphere, and that is associated with photochemical reactions of gases caused by solar radiation
ˈ ̷ ̷ˌ ̷ ̷ noun
: light that is observed especially during the night, that originates in the high atmosphere, and that is associated with photochemical reactions of gases caused by solar radiation
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012