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Noun
1. metamorphic rock
Wikipedia definition
2. Metamorphic rockMetamorphic rocks arise from the transformation of existing rock types, in a process called metamorphism, which means "change in form". The original rock is subjected to heat and pressure, (temperatures greater than 150 to 200 °C and pressures of 1500 bars) causing profound physical and/or chemical change. The protolith may be sedimentary rock, igneous rock or another older metamorphic rock.
Read “Metamorphic rock” on English Wikipedia
Read “変成岩” on Japanese Wikipedia
Read “Metamorphic rock” on DBpedia

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