metamorphism

/ˌˈmɛdəˌmɔrˈfɪzəm/

Definitions of metamorphism

1. noun

   change in the structure of rock by natural agencies such as pressure or heat or introduction of new chemical substances
   types:

   anamorphism

   metamorphism that occurs deep under the earth's surface; changes simple minerals into complex minerals

   epigenesis

   a geological change in the mineral content of rock after the rock has formed

   katamorphism

   metamorphism that occurs at or near the earth's surface; breaks down complex minerals into simpler ones

   type of:

   geologic process, geological process

   (geology) a natural process whereby geological features are modified