endomorphism

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. A change within an intrusive igneous rock caused by the assimilation of portions of the surrounding rock.
2. n. A homomorphism that maps a mathematical system into itself.

Century Dictionary and Cyclopedia

1. n. In petrography, changes brought about within the mass of an intrusive igneous rock by contact with the intruded rock. The commonest modifications are in the crystallization of the intrusive rock, which is usually more finely grained, sometimes glassy, and often more porphyritic near the contact. Less often there are changes in the composition of the intrusive rock, resulting in some cases from differentiation within the igneous magma. In rare instances there has been a diffusion of material from the surrounding rock into the intruded rock. Also called endomorphic contact-metamorphism.

Wiktionary

1. n. geology The assimilation of surrounding rock by an intrusive igneous rock
2. n. mathematics A homomorphism that maps a system to itself