A‐nor″tho‐site (?), n. [F. anorthose triclinic feldspar (fr. Gr. � priv. + � straight) + -ite.] (Petrol.) A granular igneous rock composed almost exclusively of a soda-lime feldspar, usually labradorite.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.