/ · 1894 Brewer’s · P · Plutonic Rocks
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Granites, and certain porphyries, supposed to be of igneous, but not of volcanic, origin. So called by Lyell from Pluto, the principle of elemental fire.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.