aurora borealis
Word family adjectiveauroraladverbaurorallynounaurora borealisaurora
au·ro·ra bo·re·a·lis /əˌrɔːrə bɔːriˈeɪləs, ɔː- $ -ˈæl-/ noun [singular] aurora borealis• The sky was aflame with the aurora borealis, the eerily luminous northern lights.• The aurora borealis was like that, too. Origin aurora borealis (1700-1800) Modern Latin “northern dawn”