Topaz(n.) A mineral occurring in rhombic prisms, generally yellowish and pellucid, also colorless, and of greenesh, bluish, or brownish shades. It sometimes occurs massive and opaque. It is a fluosilicate of alumina, and is used as a gem.
Topaz(n.) Either one of two species of large, brilliantly colored humming birds of the Topaza, of South America and the West Indies.
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