exomorphism

Century Dictionary and Cyclopedia

1. n. In petrography, that variety of contact-metamorphism which is developed, in the surrounding walls, by an intruded mass of eruptive rock. The commoner changes produced in the metamorphosed rock are induration and cementation in some cases, recrystallization (the conversion of carbonates into silicates) in cithers, etc.: contrasted with endomorphism, or the effects, chiefly those of chilling, produced upon the border of the eruptive itself.

Wiktionary

1. n. A change in a rock that happens when igneous material intrudes upon it.