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aurorae borealis

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aurora bo·re·al·is   (bôr'ē-āl'ĭs, bōr'-)   
n.   pl. aurora bo·re·al·is·es (-ĭ-sĭz) or aurorae borealis
An aurora that occurs in northern regions of the earth. Also called northern lights.

[New Latin aurōra boreālis : Latin aurōra, dawn + Latin boreālis, northern.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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