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2 definitions found
 for Aurora borealis
From The Collaborative International Dictionary of English v.0.48 :

  Aurora \Au*ro"ra\, n.; pl. E. Auroras, L. (rarely used)
     Auror[ae]. [L. aurora, for ausosa, akin to Gr. ?, ?, dawn,
     Skr. ushas, and E. east.]
     1. The rising light of the morning; the dawn of day; the
        redness of the sky just before the sun rises.
        [1913 Webster]
     2. The rise, dawn, or beginning. --Hawthorne.
        [1913 Webster]
     3. (Class. Myth.) The Roman personification of the dawn of
        day; the goddess of the morning. The poets represented her
        a rising out of the ocean, in a chariot, with rosy fingers
        dropping gentle dew.
        [1913 Webster]
     4. (Bot.) A species of crowfoot. --Johnson.
        [1913 Webster]
     5. The aurora borealis or aurora australis (northern or
        southern lights).
        [1913 Webster]
     Aurora borealis, i. e., northern daybreak; popularly called
        northern lights. A luminous meteoric phenomenon, visible
        only at night, and supposed to be of electrical origin.
        This species of light usually appears in streams,
        ascending toward the zenith from a dusky line or bank, a
        few degrees above the northern horizon; when reaching
        south beyond the zenith, it forms what is called the
        corona, about a spot in the heavens toward which the
        dipping needle points. Occasionally the aurora appears as
        an arch of light across the heavens from east to west.
        Sometimes it assumes a wavy appearance, and the streams of
        light are then called merry dancers. They assume a variety
        of colors, from a pale red or yellow to a deep red or
        blood color. The
     Aurora australisis a corresponding phenomenon in the
        southern hemisphere, the streams of light ascending in the
        same manner from near the southern horizon.
        [1913 Webster]

From WordNet (r) 3.0 (2006) :

  aurora borealis
      n 1: the aurora of the northern hemisphere [syn: aurora
           borealis, northern lights]

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