‖Ad′u‐la″ri‐a (�), n. [From Adula, a mountain peak in Switzerland, where fine specimens are found.] (Min.) A transparent or translucent variety of common feldspar, or orthoclase, which often shows pearly opalescent reflections; — called by lapidaries moonstone.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.