polyunsaturationn.

Brit.

/ˌpɒlɪʌnˌsatʃᵿˈreɪʃn/,

/ˌpɒlɪʌnˌsatjᵿˈreɪʃn/, U.S.

/ˌpɑliˌənˌsætʃəˈreɪʃ(ə)n/

Origin: Formed within English, by compounding. Etymons: poly- comb. form, unsaturation n.

Etymology: < poly- comb. form + unsaturation n., after polyunsaturated adj. Compare slightly earlier polyunsaturate n.

Chemistry.

The property of being polyunsaturated; the extent of this; the presence of a number of carbon–carbon double or triple bonds in a compound.

ΚΠ

1952 Jrnl. Amer. Chem. Soc. 75 3841/1 Among its polyunsaturation, mycomycin contains a monosubstituted acetylenic bond and an allenic bond.

1970 Limnol. & Oceanogr. 15 424/2 The best known response [of lipids] to the environment is increased polyunsaturation as temperature decreases.

1993 Idaho Falls Post Reg. (Nexis) 2 Mar. b1 If a label says partially hydrogenated peanut oil or corn oil or whatever, it means that a healthy oil, which had some polyunsaturation in it, has been saturated and is not healthy any more.

2003 Crop Sci. (Nexis) 43 106 Such a low oleic acid concentration is associated with a high degree of polyunsaturation in the oil, which has a marked detrimental effect on its oxidative stability.

This is a new entry (OED Third Edition, September 2006; most recently modified version published online March 2022).

单词	polyunsaturation
释义	polyunsaturationn. Brit. /ˌpɒlɪʌnˌsatʃᵿˈreɪʃn/, /ˌpɒlɪʌnˌsatjᵿˈreɪʃn/, U.S. /ˌpɑliˌənˌsætʃəˈreɪʃ(ə)n/ Origin: Formed within English, by compounding. Etymons: poly- comb. form, unsaturation n. Etymology: < poly- comb. form + unsaturation n., after polyunsaturated adj. Compare slightly earlier polyunsaturate n. Chemistry. The property of being polyunsaturated; the extent of this; the presence of a number of carbon–carbon double or triple bonds in a compound. ΚΠ 1952 Jrnl. Amer. Chem. Soc. 75 3841/1 Among its polyunsaturation, mycomycin contains a monosubstituted acetylenic bond and an allenic bond. 1970 Limnol. & Oceanogr. 15 424/2 The best known response [of lipids] to the environment is increased polyunsaturation as temperature decreases. 1993 Idaho Falls Post Reg. (Nexis) 2 Mar. b1 If a label says partially hydrogenated peanut oil or corn oil or whatever, it means that a healthy oil, which had some polyunsaturation in it, has been saturated and is not healthy any more. 2003 Crop Sci. (Nexis) 43 106 Such a low oleic acid concentration is associated with a high degree of polyunsaturation in the oil, which has a marked detrimental effect on its oxidative stability. This is a new entry (OED Third Edition, September 2006; most recently modified version published online March 2022). < n.1952
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