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hydro-metamorphism
hydro-metamorphism n.
Brit. 
/ˌhʌɪdrə(ʊ)mɛtəˈmɔːfɪz(ə)m/
, /ˌhʌɪdrə(ʊ)mɛtəˈmɔːfɪz(ə)m/U.S. /ˌhaɪdroʊˌmɛdəˈmɔrˌfɪz(ə)m/
Geology a kind of metamorphism n. of igneous rocks effected by means of water./ˌhaɪdroʊˌmɛdəˈmɔrˌfɪz(ə)m/ΚΠ
1879 F. Rutley Study of Rocks xii. 208 Hydro-metamorphism, by which rocks, originally fused, and when in liquid fusion, poured into veins and dykes in pre-existing rocks, are subsequently altered in specific gravity and arrangement of minerals, by the action of water.
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