n.
Pronunciation: ə - ' ro ̇ r- ə , o ̇ -
Function: noun
Inflected Form: plural auroras or au · ro · rae \ -( ˌ ) ē \
Etymology: Latin ― more at EAST
Date: 14th century
1 : DAWN
2 capitalized : the Roman goddess of dawn ― compare EOS
3 : a luminous phenomenon that consists of streamers or arches of light appearing in the upper atmosphere of a planet's magnetic polar regions and is caused by the emission of light from atoms excited by electrons accelerated along the planet's magnetic field lines
– au · ro · ral \ - ə l \ adjective
– au · ro · re · an \ - ē - ə n \ adjective