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3 definitions found

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

 opal /ˈopəl/

From: Webster's Revised Unabridged Dictionary (1913)

 O·pal n.  Min. A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
 Note:The precious opal presents a peculiar play of colors of delicate tints, and is highly esteemed as a gem.  One kind, with a varied play of color in a reddish ground, is called the harlequin opal.  The fire opal has colors like the red and yellow of flame.  Common opal has a milky appearance.  Menilite is a brown impure variety, occurring in concretions at Menilmontant, near Paris.  Other varieties are cacholong, girasol, hyalite, and geyserite.

From: WordNet (r) 2.0

      n : a translucent mineral consisting of hydrated silica of
          variable color; some varieties are used as gemstones