Learn That Word

Synonyms for Aureole (same or very similar meaning)

WordNet sense 1 (the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipse):

WordNet sense 2 (an indication of radiant light drawn around the head of a saint):
aura, glory, halo, nimbus, gloriole

From the ODE community, based on WordNetadd/edit