metamorphismn.

Brit.

/ˌmɛtəˈmɔːfɪz(ə)m/, U.S.

/ˌmɛdəˈmɔrˌfɪz(ə)m/

Origin: A borrowing from French. Etymon: French métamorphisme.

Etymology: < French métamorphisme (1823) < métamorph- (in métamorphose : see metamorphosis n.) + -isme -ism suffix. Compare Italian metamorfismo (late 19th cent.).

1. Geology. Change in the structural, mineralogical, or chemical characteristics of rocks; (later) spec. that produced by chemical and physical forces operating at depth, such as pressure, heat, or volatile content; the processes resulting in such change. Also with distinguishing word.contact, dynamic, regional metamorphism: see the first element.

ΘΚΠ

the world > the earth > structure of the earth > formation of features > metamorphism > [noun]

metamorphism1845

regional metamorphism1861

contact metamorphism1876

plutonometamorphism1889

thermo-metamorphism1889

anamorphism1904

katamorphism1904

symphrattism1904

the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > quality

metamorphism1845

1845 Encycl. Metrop. VI. 564/1 By the metamorphism of the chalk into the characters of primary limestone.

1859 D. Page Handbk. Geol. Terms 250 This change, or metamorphism, whether produced by heat, pressure, or chemical agency, has conferred upon them [sc. the crystalline schists] the term of Metamorphic rocks.

1916 F. H. Lahee Field Geol. ix. 230 Any kind of alteration that any rock has undergone, whether katamorphic or anamorphic, comes under the head of metamorphism, but there are many geologists who prefer to restrict the meaning of the more general term so that it does not include weathering.

1979 D. L. Dineley Fossils vii. 147 Metamorphism by heat or pressure are obvious means by which fossils are destroyed.

1993 Jrnl. Petrol. 34 716 The volcanic sequence experienced burial metamorphism during Silurian times and subsequent low-grade regional metamorphism in early Devonian times.

2. Biology. = metamorphosis n. 3. rare.

ΘΚΠ

the world > animals > invertebrates > phylum Arthropoda > class Insecta > eggs or young > [noun] > young or development of young > larva > process of metamorphosis

transformation1663

complete metamorphosis1826

metamorphism1866

palingenesis1882

1866 R. Tate Plain & Easy Acct. Mollusks Great Brit. iv. 153 An insect in its second stage of metamorphism.

1984 Systematic Bot. 9 374 Because of the extended ontogeny of modular organisms evolutionary diversification is likely to involve extensive neotenous metamorphism.

This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).

单词	metamorphism
释义	metamorphismn. Brit. /ˌmɛtəˈmɔːfɪz(ə)m/, U.S. /ˌmɛdəˈmɔrˌfɪz(ə)m/ Origin: A borrowing from French. Etymon: French métamorphisme. Etymology: < French métamorphisme (1823) < métamorph- (in métamorphose : see metamorphosis n.) + -isme -ism suffix. Compare Italian metamorfismo (late 19th cent.). 1. Geology. Change in the structural, mineralogical, or chemical characteristics of rocks; (later) spec. that produced by chemical and physical forces operating at depth, such as pressure, heat, or volatile content; the processes resulting in such change. Also with distinguishing word.contact, dynamic, regional metamorphism: see the first element. ΘΚΠ the world > the earth > structure of the earth > formation of features > metamorphism > [noun] metamorphism1845 regional metamorphism1861 contact metamorphism1876 plutonometamorphism1889 thermo-metamorphism1889 anamorphism1904 katamorphism1904 symphrattism1904 the world > the earth > structure of the earth > constituent materials > rock > metamorphic rock > [noun] > quality metamorphism1845 1845 Encycl. Metrop. VI. 564/1 By the metamorphism of the chalk into the characters of primary limestone. 1859 D. Page Handbk. Geol. Terms 250 This change, or metamorphism, whether produced by heat, pressure, or chemical agency, has conferred upon them [sc. the crystalline schists] the term of Metamorphic rocks. 1916 F. H. Lahee Field Geol. ix. 230 Any kind of alteration that any rock has undergone, whether katamorphic or anamorphic, comes under the head of metamorphism, but there are many geologists who prefer to restrict the meaning of the more general term so that it does not include weathering. 1979 D. L. Dineley Fossils vii. 147 Metamorphism by heat or pressure are obvious means by which fossils are destroyed. 1993 Jrnl. Petrol. 34 716 The volcanic sequence experienced burial metamorphism during Silurian times and subsequent low-grade regional metamorphism in early Devonian times. 2. Biology. = metamorphosis n. 3. rare. ΘΚΠ the world > animals > invertebrates > phylum Arthropoda > class Insecta > eggs or young > [noun] > young or development of young > larva > process of metamorphosis transformation1663 complete metamorphosis1826 metamorphism1866 palingenesis1882 1866 R. Tate Plain & Easy Acct. Mollusks Great Brit. iv. 153 An insect in its second stage of metamorphism. 1984 Systematic Bot. 9 374 Because of the extended ontogeny of modular organisms evolutionary diversification is likely to involve extensive neotenous metamorphism. This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022). < n.1845
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