Met′a‐so″ma‐tism (?), n. [Pref. meta- + Gr. �, �, body.] (Geol.) An alteration in a mineral or rock mass when involving a chemical change of the substance, as of chrysolite to serpentine; — opposed to ordinary metamorphism, as implying simply a recrystallization. — Met′a‐so‐mat″ic (#), a.
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Webster's Dictionary 1913
Webster's Revised Unabridged Dictionary, C. & G. Merriam Co., 1913.