subfractionn.

Brit.

/ˈsʌbˌfrakʃn/, U.S.

/ˈsəbˌfrækʃ(ə)n/

Origin: Formed within English, by derivation. Etymons: sub- prefix, fraction n.

Etymology: < sub- prefix + fraction n.In sense 1 apparently after Italian soffratta (13th cent.), although this generally has the sense ‘poverty, need’.

†1. An act of breaking up or destroying; the result of this. Cf. fraction n. 1, 2. Obsolete. rare.

ΚΠ

1611 J. Florio Queen Anna's New World of Words at Soffràtta A subfraction, a routing,..a ruine, a destruction.

2. Mathematics. A fraction of a fraction (fraction n. 5a).

ΚΠ

1612 W. Colson Art Arith. in Gen. Treasury sig. A aa b/2 Subfraction, or fraction of fraction, as ¹/ ₂ of ¹/ ₂.

1817 H. T. Colebrooke tr. Bhāskara Āchārya in Algebra 14 Assimilation of sub-fractions, or making uniform the fraction of a fraction.

1917 Educ. Found. 29 178/2 Each carton is a fraction of the order, each box a sub fraction.

2001 Scand. Jrnl. Econ. 103 374 A subfraction p(1 − p) of dynastic members are altruistic children of a selfish parent.

3. Chemistry and Biochemistry. Each of the portions into which a fraction obtained by fractionation may be further separated.

ΘΚΠ

the world > matter > chemistry > organic chemistry > chemical processes or reactions > biochemical reactions and processes > [noun] > subfractionation > subfraction

subfraction1886

1886 Jrnl. Chem. Soc. 49 19 Each of these fractions was then decanted, and submitted to refractionation, all of such fractions distilling below 300° being separated carefully into sub-fractions of 5° each.

1905 Jrnl. Physiol. 32 269 A further quantity of the salt solution is added till a small precipitate appears, that is, a sub-fraction, or fraction of a fraction is taken.

1946 Nature 5 Oct. 474/1 The division of the combined cystine in wool into four sub-fractions of different chemical reactivity.

2010 A. Nag Biosyst. Engin. vii. 227 These compounds have between 5 and 13 atoms of carbon and are commonly divided into two subfractions.

This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022).

单词	subfraction
释义	subfractionn. Brit. /ˈsʌbˌfrakʃn/, U.S. /ˈsəbˌfrækʃ(ə)n/ Origin: Formed within English, by derivation. Etymons: sub- prefix, fraction n. Etymology: < sub- prefix + fraction n.In sense 1 apparently after Italian soffratta (13th cent.), although this generally has the sense ‘poverty, need’. †1. An act of breaking up or destroying; the result of this. Cf. fraction n. 1, 2. Obsolete. rare. ΚΠ 1611 J. Florio Queen Anna's New World of Words at Soffràtta A subfraction, a routing,..a ruine, a destruction. 2. Mathematics. A fraction of a fraction (fraction n. 5a). ΚΠ 1612 W. Colson Art Arith. in Gen. Treasury sig. A aa b/2 Subfraction, or fraction of fraction, as ¹/ ₂ of ¹/ ₂. 1817 H. T. Colebrooke tr. Bhāskara Āchārya in Algebra 14 Assimilation of sub-fractions, or making uniform the fraction of a fraction. 1917 Educ. Found. 29 178/2 Each carton is a fraction of the order, each box a sub fraction. 2001 Scand. Jrnl. Econ. 103 374 A subfraction p(1 − p) of dynastic members are altruistic children of a selfish parent. 3. Chemistry and Biochemistry. Each of the portions into which a fraction obtained by fractionation may be further separated. ΘΚΠ the world > matter > chemistry > organic chemistry > chemical processes or reactions > biochemical reactions and processes > [noun] > subfractionation > subfraction subfraction1886 1886 Jrnl. Chem. Soc. 49 19 Each of these fractions was then decanted, and submitted to refractionation, all of such fractions distilling below 300° being separated carefully into sub-fractions of 5° each. 1905 Jrnl. Physiol. 32 269 A further quantity of the salt solution is added till a small precipitate appears, that is, a sub-fraction, or fraction of a fraction is taken. 1946 Nature 5 Oct. 474/1 The division of the combined cystine in wool into four sub-fractions of different chemical reactivity. 2010 A. Nag Biosyst. Engin. vii. 227 These compounds have between 5 and 13 atoms of carbon and are commonly divided into two subfractions. This entry has been updated (OED Third Edition, June 2012; most recently modified version published online March 2022). < n.1611
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