carbon cyclen.

Brit.

/ˈkɑːbən ˌsʌɪkl/, U.S.

/ˈkɑrbən ˌsaɪk(ə)l/

Origin: Formed within English, by compounding. Etymons: carbon n., cycle n.¹

Etymology: < carbon n. + cycle n.¹

1. The series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by the photosynthesis of plants and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels. In later use often extended to include the incorporation of carbon dioxide in sedimentary rocks and its eventual release through subduction and volcanic activity.

ΘΚΠ

the world > life > biology > balance of nature > environment or habitat > [noun] > carbon cycle

carbon cycle1901

1901 H. W. Conn Agric. Bacteriol. 75 (caption) The carbon cycle.

1903 Elem. School Teacher 4 U5 Carbon cycle—law of conservation of matter and energy as illustrated by the cycle of carbon from the inorganic state through vegetable and animal life, back into the inorganic state.

1934 F. S. Baker Theory & Pract. Silviculture v. 84 We have already noted the presence of a water cycle and a carbon cycle, upon which the carbohydrate metabolism of the tree most directly rests.

1967 R. W. Fairbridge Encycl. Atmospheric Sci. & Astrogeol. 131/2 Since the end of World War II, the study of the carbon cycle has attracted increasingly more attention due to its significances in meteorological, geological, biological, and oceanographic problems.

1989 S. H. Schneider Global Warming v. 103 The more rapidly the climate warms up, the more likely it is that major feedback processes in the carbon cycle will significantly change current projections of greenhouse gas buildup.

2003 B. Bryson Short Hist. Nearly Everything (2004) xii. 232 Earthquakes, the formation of island chains, the carbon cycle, the locations of mountains, the coming of ice ages, the origins of life itself—there was hardly a matter that wasn't directly influenced by this remarkable new theory [sc. plate tectonics].

2. Astronomy. A cycle of thermonuclear reactions thought to occur within stars, in which carbon acts as a catalyst in the conversion of hydrogen into helium, releasing energy which provides the source of the energy radiated by the sun and stars.

ΘΚΠ

the world > the universe > star > star-matter > [noun] > stellar process

agglutination1753

nebularizationa1892

fission1919

carbon cycle1940

r-process1956

s-process1956

nucleosynthesis1957

starquake1969

1940 H. A. Bethe in Astrophysical Jrnl. 92 118 The nuclear reactions involved in the carbon cycle.

1946 Ann. Reg. 1945 356 It is generally accepted that the Bethe carbon cycle..provides the main source of stellar energy.

1983 Science 25 Nov. 881/2 Investigating the reactions in the carbon cycle, the most important of which are proton captures with the emission of gamma rays.

1995 L. Motz & J. A. Weaver Story of Astron. xvi. 303 Owing to their massiveness, these stars built up helium and carbon very quickly so that the carbon cycle took over in a relatively short time.

This entry has been updated (OED Third Edition, December 2008; most recently modified version published online December 2021).

单词	carbon cycle
释义	carbon cyclen. Brit. /ˈkɑːbən ˌsʌɪkl/, U.S. /ˈkɑrbən ˌsaɪk(ə)l/ Origin: Formed within English, by compounding. Etymons: carbon n., cycle n.¹ Etymology: < carbon n. + cycle n.¹ 1. The series of processes by which carbon compounds are interconverted in the environment, involving the incorporation of carbon dioxide into living tissue by the photosynthesis of plants and its return to the atmosphere through respiration, the decay of dead organisms, and the burning of fossil fuels. In later use often extended to include the incorporation of carbon dioxide in sedimentary rocks and its eventual release through subduction and volcanic activity. ΘΚΠ the world > life > biology > balance of nature > environment or habitat > [noun] > carbon cycle carbon cycle1901 1901 H. W. Conn Agric. Bacteriol. 75 (caption) The carbon cycle. 1903 Elem. School Teacher 4 U5 Carbon cycle—law of conservation of matter and energy as illustrated by the cycle of carbon from the inorganic state through vegetable and animal life, back into the inorganic state. 1934 F. S. Baker Theory & Pract. Silviculture v. 84 We have already noted the presence of a water cycle and a carbon cycle, upon which the carbohydrate metabolism of the tree most directly rests. 1967 R. W. Fairbridge Encycl. Atmospheric Sci. & Astrogeol. 131/2 Since the end of World War II, the study of the carbon cycle has attracted increasingly more attention due to its significances in meteorological, geological, biological, and oceanographic problems. 1989 S. H. Schneider Global Warming v. 103 The more rapidly the climate warms up, the more likely it is that major feedback processes in the carbon cycle will significantly change current projections of greenhouse gas buildup. 2003 B. Bryson Short Hist. Nearly Everything (2004) xii. 232 Earthquakes, the formation of island chains, the carbon cycle, the locations of mountains, the coming of ice ages, the origins of life itself—there was hardly a matter that wasn't directly influenced by this remarkable new theory [sc. plate tectonics]. 2. Astronomy. A cycle of thermonuclear reactions thought to occur within stars, in which carbon acts as a catalyst in the conversion of hydrogen into helium, releasing energy which provides the source of the energy radiated by the sun and stars. ΘΚΠ the world > the universe > star > star-matter > [noun] > stellar process agglutination1753 nebularizationa1892 fission1919 carbon cycle1940 r-process1956 s-process1956 nucleosynthesis1957 starquake1969 1940 H. A. Bethe in Astrophysical Jrnl. 92 118 The nuclear reactions involved in the carbon cycle. 1946 Ann. Reg. 1945 356 It is generally accepted that the Bethe carbon cycle..provides the main source of stellar energy. 1983 Science 25 Nov. 881/2 Investigating the reactions in the carbon cycle, the most important of which are proton captures with the emission of gamma rays. 1995 L. Motz & J. A. Weaver Story of Astron. xvi. 303 Owing to their massiveness, these stars built up helium and carbon very quickly so that the carbon cycle took over in a relatively short time. This entry has been updated (OED Third Edition, December 2008; most recently modified version published online December 2021). < n.1901
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