Definition of regional metamorphism in English:

regional metamorphism

Syllabification: re·gion·al met·a·mor·phism

Entry from US English dictionary

noun

Geology
Metamorphism affecting rocks over an extensive area as a result of the large-scale action of heat and pressure. Compare with contact metamorphism.

Definition of regional metamorphism in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)