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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 sundog
 幻日

From: Webster's Revised Unabridged Dictionary (1913)

 Sun·dog n. Meteorol.
 1. A luminous spot occasionally seen a few degrees from the sun, supposed to be formed by the intersection of two or more halos, or in a manner similar to that of halos.
 2. A fragmentary rainbow; a small rainbow near the horizon; -- called also dog and weathergaw.
 

From: WordNet (r) 2.0

 sundog
      n : a bright spot on the parhelic circle; caused by diffraction
          by ice crystals; "two or more parhelia are usually seen
          at once" [syn: parhelion, mock sun]