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Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
(1910) On a group of minerals formed by the combustion of pyritous shales in Midlothian.
In a well known paper dealing with the causes of earthquakes, Stephen Hales noted that pyritous minerals within the Earth exhale sulphureous vapors that rise into the atmosphere.