CO2n.

Brit.

/ˌsiːəʊˈtuː/, U.S.

/ˌsiˌoʊˈtu/

Origin: Formed within English, by compounding. Etymons: C n., O n.¹, two n.

Etymology: < CO₂, chemical formula representing carbon dioxide < C n., chemical symbol for carbon + O n.¹, chemical symbol for oxygen + two n.The modern notation of CO₂ did not become established until the mid 19th cent. John Dalton ( New Syst. Chem. Philos. (1810) II. 381–2) regarded carbon dioxide (carbonic acid) as composed of one atom of carbon (referred to as charcoal) with two of oxygen. The chemical symbols for carbon and oxygen were introduced by Berzelius. He also assigned carbon dioxide the modern formula, but wrote it CO². 1814 J. Black tr. J. J. Berzelius Attempt Sci. Syst. Mineral. 73 This mineral, which most frequently appears mixed with greater quantities than in the present example of magnesia, lime, or carbonate of manganese, is obviously a carbonate of iron composed = FeO² + 2CO².1840 H. Reid Elem. Chem. 180 The oxalic acid consists of carbon, oxygen, and hydrogen, in such proportions that they may theoretically be looked upon as arranged on the form of carbonic oxide, carbonic acid, and water—or symbolically, CO+ CO² + HO.1849 H. Watts tr. L. Gmelin Hand-bk. Chem. II. 189 The sulphates of bismuth, silver, and protoxide of mercury..are resolved into reduced metal and equal volumes of sulphurous and carbonic acid gases: AgO, SO³ + C = Ag + SO² + CO².

Carbon dioxide, a colourless, odourless gas produced by the burning of organic compounds and fossil fuels, by the processes of respiration and decomposition, and by volcanic activity, and absorbed by plants during photosynthesis.In later use, often in the context of environmental issues and climate change.

ΚΠ

1850 Ann. Rep. Progr. Chem. 1847–8 2 445 It is distinguished by containing CoO, CO₂, which has hitherto been met with only in the calcareous sinter from Riechelsdorf.

1895 Philos. Trans. B 186 507 There is, without doubt, a tendency shown for the exhalation of CO₂ to follow the distribution of stomata.

1948 Life 6 Sept. 37/1 (advt.) As any high school chemistry student knows, CO₂ will not burn.

1992 N.Y. Rev. Bks. 25 June 58/2 The principal disingenuousness in the administration's no-regrets policy is thus its unwillingness to deal seriously with CO₂ emissions in the United States.

2021 Guardian (Nexis) 20 Feb. If we have any chance of maintaining a safe climate, we have to get off fossil fuels as quickly as possible and then pull a large amount of CO₂ out of the atmosphere.

This is a new entry (OED Third Edition, December 2021).

单词	co2
释义	CO2n. Brit. /ˌsiːəʊˈtuː/, U.S. /ˌsiˌoʊˈtu/ Origin: Formed within English, by compounding. Etymons: C n., O n.¹, two n. Etymology: < CO₂, chemical formula representing carbon dioxide < C n., chemical symbol for carbon + O n.¹, chemical symbol for oxygen + two n.The modern notation of CO₂ did not become established until the mid 19th cent. John Dalton ( New Syst. Chem. Philos. (1810) II. 381–2) regarded carbon dioxide (carbonic acid) as composed of one atom of carbon (referred to as charcoal) with two of oxygen. The chemical symbols for carbon and oxygen were introduced by Berzelius. He also assigned carbon dioxide the modern formula, but wrote it CO². 1814 J. Black tr. J. J. Berzelius Attempt Sci. Syst. Mineral. 73 This mineral, which most frequently appears mixed with greater quantities than in the present example of magnesia, lime, or carbonate of manganese, is obviously a carbonate of iron composed = FeO² + 2CO².1840 H. Reid Elem. Chem. 180 The oxalic acid consists of carbon, oxygen, and hydrogen, in such proportions that they may theoretically be looked upon as arranged on the form of carbonic oxide, carbonic acid, and water—or symbolically, CO+ CO² + HO.1849 H. Watts tr. L. Gmelin Hand-bk. Chem. II. 189 The sulphates of bismuth, silver, and protoxide of mercury..are resolved into reduced metal and equal volumes of sulphurous and carbonic acid gases: AgO, SO³ + C = Ag + SO² + CO². Carbon dioxide, a colourless, odourless gas produced by the burning of organic compounds and fossil fuels, by the processes of respiration and decomposition, and by volcanic activity, and absorbed by plants during photosynthesis.In later use, often in the context of environmental issues and climate change. ΚΠ 1850 Ann. Rep. Progr. Chem. 1847–8 2 445 It is distinguished by containing CoO, CO₂, which has hitherto been met with only in the calcareous sinter from Riechelsdorf. 1895 Philos. Trans. B 186 507 There is, without doubt, a tendency shown for the exhalation of CO₂ to follow the distribution of stomata. 1948 Life 6 Sept. 37/1 (advt.) As any high school chemistry student knows, CO₂ will not burn. 1992 N.Y. Rev. Bks. 25 June 58/2 The principal disingenuousness in the administration's no-regrets policy is thus its unwillingness to deal seriously with CO₂ emissions in the United States. 2021 Guardian (Nexis) 20 Feb. If we have any chance of maintaining a safe climate, we have to get off fossil fuels as quickly as possible and then pull a large amount of CO₂ out of the atmosphere. This is a new entry (OED Third Edition, December 2021). < n.1850
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