From The Collaborative International Dictionary of English v.0.48 [gcide]:
3. (Geol.) Pertaining to, produced by, or exhibiting, certain changes which minerals or rocks may have undergone since their original deposition; -- especially applied to the recrystallization which sedimentary rocks have undergone through the influence of heat and pressure, after which they are called metamorphic rocks.
From WordNet (r) 3.0 (2006) [wn]:
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