aurora bo·re·al·is (bôr'ē-āl'ĭs, bōr'-) n.
pl.aurora bo·re·al·is·es (-ĭ-sĭz) or aurorae borealis An aurora that occurs in northern regions of the earth. Also called northern lights.
[New Latin aurōra boreālis : Latin aurōra, dawn + Latin boreālis, northern.]