noun Date: 1810 vivid and extensive flashes of electric light without thunder seen near the horizon especially at the close of a hot day and ascribed to far-off lightning reflected by high clouds
HEAT LIGHTNING
Meaning of HEAT LIGHTNING in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012