American Heritage Dictionary
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Century Dictionary
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GNU Webster's 1913
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WordNet
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When the aurora is stronger, the extent of the light-crown is altered double or multiple arcs are seen, generally lying in about the same plane and with a common centre, and rays are cast between the different arcs.— The Voyage of the Vega round Asia and Europe, Volume I and Volume II
The spectroscope showed that it was decidedly auroral, but as the aurora was seen on the dark disc of the moon it must have been due to the earth's atmosphere.— Personal Recollections, from Early Life to Old Age, of Mary Somerville
In the midst of the aurora, a great circular disk of greenish light appeared and moved smoothly across the sky.— The Book of the Damned

American Heritage Dictionary (1)
Century Dictionary (1)
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