subfractionn.
/ˈsʌbˌfrakʃn/, U.S. /ˈsəbˌfrækʃ(ə)n/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).
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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.
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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).
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