Plu″to‐nism (?), n. [Cf. F. plutonisme.] The theory, early advanced in geology, that the successive rocks of the earth″s crust were formed by igneous fusion; — opposed to the Neptunian theory.
Content
Rights and sources
Review source, license and attribution information for this content.
Content
Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.