AURORAL
\ɐɹˈɔːɹə͡l], \ɐɹˈɔːɹəl], \ɐ_ɹ_ˈɔː_ɹ_əl]\
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of or relating to the atmospheric phenomenon auroras; "a prominent green line in the spectrum of the auroras is called the `auroral line'"
By Princeton University