Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for opal from the 1913 edition of Webster's Revised Unabridged Dictionary. Define opal using one of the most comprehensive free online dictionaries on the web.

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Part of Speech: noun
Results: 1
1. A mineral consisting, like quartz, of silica, but inferior to quartz in hardness and specific gravity.
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