pertaining to or characterized by change of form, or metamorphosis.
Geology. pertaining to or exhibiting structural change or metamorphism.

1810–20; meta- + -morphic

nonmetamorphic, adjective
premetamorphic, adjective
unmetamorphic, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
metamorphic or metamorphous (ˌmɛtəˈmɔːfɪk)
1.  relating to or resulting from metamorphosis or metamorphism
2.  igneous Compare sedimentary (of rocks) altered considerably from their original structure and mineralogy by pressure and heat
metamorphous or metamorphous

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

in geological sense, 1833, in Lyell, from metamorphosis. Rock whose form has been changed by heat or pressure.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
metamorphic   (mět'ə-môr'fĭk)  Pronunciation Key 
  1. Zoology Relating to metamorphosis.

  2. Geology Relating to rocks that have undergone metamorphism. Metamorphic rocks are formed when igneous, sedimentary, or other metamorphic rocks undergo a physical change due to extreme heat and pressure. These changes often produce folded layers or banding in the rocks, and they can also cause pockets of precious minerals to form. The folds and banding can be produced by incomplete segregation of minerals during recrystallization, or they can be inherited from preexisting beds in sedimentary rocks or preexisting layers in igneous rocks. The precious minerals can form as the result of recrystallization when the rocks undergoing metamorphism are subjected to changes in pressure and temperature.

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