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proper noun 
  1. (given name, female) from the precious stone, invented in the nineteenth century.
  2. A type of petrol made by the BP company designed to be unable to used for petrol sniffing. (Reference: BP article on Opal http://www.bp.com/sectiongenericarticle.do?categoryId=9008933&contentId=7016884.)

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opal Tweet Definition of opal Like Definition of opal on Facebook
noun 
  1. (mineralogy) A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
  2. (biology), (genetics), (biochemistry) A colloquial name used in molecular biology referring to a particular stop codon sequence, "UGA."
Etymology: In Florio's A World of Words 1598 as opale, from French opale or opalle, from Latin opalus, probably from Greek á (opallios), maybe from Sanskrit upala-s "gem" or "opal".<ref>Chambers Dictionary of Etymology, Robert K. Barnhart (ed.), Chambers, 1988</ref>


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