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2 definitions found

From: Webster's Revised Unabridged Dictionary (1913)

 Zo·di·a·cal a.  Astron. Of or pertaining to the zodiac; situated within the zodiac; as, the zodiacal planets.
 Zodiacal light, a luminous tract of the sky, of an elongated, triangular figure, lying near the ecliptic, its base being on the horizon, and its apex at varying altitudes. It is to be seen only in the evening, after twilight, and in the morning before dawn. It is supposed to be due to sunlight reflected from multitudes of meteoroids revolving about the sun nearly in the plane of the ecliptic.
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From: WordNet (r) 2.0

 zodiacal light
      n : a luminous tract in the sky; a reflection of sunlight from
          cosmic dust in the plane of the ecliptic; visible just
          before sunrise and just after sunset