— metasomatic /met'euh soh mat"ik/ , adj.
/met'euh soh"meuh tiz'euhm/ , n. Geol.
1. the series of metamorphic processes whereby chemical changes occur in minerals or rocks as a result of the introduction of material, often in hot aqueous solutions, from external sources.
2. replacement (def. 4).
Also, metasomatosis .
[ 1885-90; META- + SOMAT- + -ISM ]