1550s, "pertaining to dawn," from aurora + -al (1). Meaning "of the color of dawn" is from 1827; meaning "of the aurora borealis" is from 1828.
a prominent green line in the spectrum of the auroras is called the `auroral line'
a dim auroral glow
auriferous
Auriga
aurochs
aurora
aurora borealis
auroral
*aus-
auscultate
auscultation
auspex
auspices
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