aureole(noun) noun1. the outermost region of the sun's atmosphere; visible as a white halo during a solar eclipseSimilar word(s): coronaDefinition categories: phenomenon, glow, glowing, radiance2. an indication of radiant light drawn around the head of a saintSimilar word(s): aura, gloriole, glory, halo, nimbusDefinition categories: attribute, light, lightness