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Definition of: metasomatosis
(met′ə·sō′mə·tō′sis) noun Geol.
That form of metamorphism by means of which a rock or mineral undergoes chemical change through the action of external materials. Also met′a·so′ma·tism (-sō′mə·tiz′əm). [<META- + SOMAT(O)- + -OSIS]
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