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单词 metagenetic
释义

metageneticadj.

Brit. /ˌmɛtədʒᵻˈnɛtɪk/, U.S. /ˈˌmɛdədʒəˈnɛdɪk/
Origin: Formed within English, by derivation. Etymons: meta- prefix, -genetic comb. form.
Etymology: < meta- prefix + -genetic comb. form. In sense 3 probably after Russian metagenetičeskij. Compare metagenesis n.
1. Zoology. Of, relating to, characterized by, or involving metagenesis.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [adjective] > alternate generation
metagenetic1849
heterogenetic1872
metagenic1883
heterogenic1901
heterogamic1904
1849 R. Owen Parthenogenesis 17 The successive generations, which..complete the metagenetic cycle.
1877 Encycl. Brit. VII. 629/1 The peculiar metagenetic mode of development.
1942 Ecol. Monogr. 12 364 Among animals that have received two names as a consequence of metagenetic changes are: flukes, tapeworms, some roundworms, polyps, and jelly fishes.
1984 Adv. in Invertebr. Reprod. 3 270 A classical metagenetic cycle including sessile asexually multiplying polyps and pelagic medusae which reproduce sexually.
1997 Internat. Jrnl. Developmental Biol. 40 331 Most, if not all, major events in the metagenetic life-cycle of Cassiopea..depend on the interaction with specific biotic and physical cues.
2. Crystallography. Designating twin crystals in which the compound structure is secondary rather than primary. Cf. paragenetic adj. 2. Obsolete. rare.
ΚΠ
1883 Encycl. Brit. XVI. 367/1 In metagenetic twins the crystal was at first simple, but afterwards, through some change in the material furnished for its increase or possibly induced in itself, it received new layers, or an extension in a reversed position.
3. Geology. Of, relating to, or involving metagenesis.metagenic adj. is earlier in this sense.
ΘΚΠ
the world > the earth > structure of the earth > formation of features > metamorphism > [noun] > others
flintifying1799
anthracitization1875
marmarosis1882
granitization1893
marmorosis1909
amphibolitization1918
hybridization1926
hornfelsing1930
amphibolization1932
diaphthoresis1932
metagenetic1963
rodingitization1971
1963 Internat. Geol. Rev. 7 1163 (heading) Nature of regional epigenetic and metagenetic facies.
1986 Geochem. Internat. 23 74 This organic matter..is easily converted to gas and petroleum under the catagenetic and metagenetic temperature regimes of increasing burial.
1999 Chem. Geol. 156 41 It is still not yet clear whether the enormous dry-gas accumulations in Cenomanian reservoirs are of microbial, ‘early-thermogenic’ or catagenetic/metagenetic origin.

Derivatives

metageˈnetically adv. rare by means of metagenesis.
ΘΚΠ
the world > life > biology > biological processes > procreation or reproduction > types of reproduction > [adverb] > others
viviparously1822
agamically1858
agamogenetically1868
metagenetically1868
parthenogenetically1874
parthenogenically1911
apomictically1921
pseudosexually1964
1868 C. Darwin Variation Animals & Plants II. 367 If, instead of a single individual, several were to be thus developed metagenetically within a pre-existing form.
This entry has been updated (OED Third Edition, December 2001; most recently modified version published online March 2022).
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adj.1849
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