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ultrametamorphism

[uhl-truh-met-uh-mawr-fiz-uh m] /ˌʌl trəˌmɛt əˈmɔr fɪz əm/
noun, Geology
1.
metamorphism during which the temperature of a rock exceeds its melting point.
Origin
Related forms
ultrametamorphic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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