yocto-comb. form

Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Some degree of stress is usually maintained on the first syllable, e.g. yoctosecond Brit.

/ˈjɒktə(ʊ)ˌsɛknd/, U.S.

/ˈjɑktoʊˌsɛk(ə)n(d)/.

Origin: A variant or alteration of another lexical item. Etymon: octo- comb. form.

Etymology: An arbitrary alteration of octo- comb. form, so called with reference to the unit being eight orders of magnitude smaller than one thousandth (10⁻³). Compare zepto- comb. form, and also yotta- comb. form, zetta- comb. form.The unit prefix was officially accepted by the General Conference on Weights and Measures in 1991. On the further background compare:1994 Q. Jrnl. Royal Astron. Soc. 25 570 In 1990 the International Union of Pure and Applied Chemistry..offered for discussion a suggestion for sepo and oco, from Latin septo, seven and octo, eight. Because the symbol s for sepo would be the same as the symbol for the second, while the symbol o for oco could be misread as a zero, these eventually became zepto (10⁻²¹) and yocto (10⁻²⁴).

Used in the names of units of measurement to denote a factor of 10⁻²⁴ (one million million million millionth; one thousandth to the power of eight), as yoctogram, yoctomole, yoctosecond. Symbol y.

1991 Rapport de la 10^e Session, Commité Consultatif des Uniés (Bureau Internat. des Poids et Mesures) u44 After further discussion along this line the CCU decided as follows:..10⁻²¹ zepto [symbol] z... 10⁻²⁴ yocto [symbol] y.

1994 New Scientist 3 Dec. 81/2 The elementary charge is 1.6 x 10⁻¹⁹ coulombs (160 zeptocoulombs) and the mass of a proton is 1.7 yoctograms.

1996 N.Y. Times Mag. 14 Jan. 12 A yoctosecond, equivalent to .000000000000000000000001—that's 23 zeros, is the smallest designated unit of time.

2004 Nature 29 July 522/2 Their mass-spectrometry approach can detect 800 yoctomoles (800 × 10⁻²⁴ moles) of des-Arg⁹-bradykinin.

2006 R. Dawkins God Delusion 155 The ‘inflation’ that physicists postulate as occupying some fraction of the first yoctosecond of the universe's existence.

This is a new entry (OED Third Edition, December 2016; most recently modified version published online December 2021).

单词	yocto-
释义	yocto-comb. form Stress is usually determined by a subsequent element and vowels may be reduced accordingly. Some degree of stress is usually maintained on the first syllable, e.g. yoctosecond Brit. /ˈjɒktə(ʊ)ˌsɛknd/, U.S. /ˈjɑktoʊˌsɛk(ə)n(d)/. Origin: A variant or alteration of another lexical item. Etymon: octo- comb. form. Etymology: An arbitrary alteration of octo- comb. form, so called with reference to the unit being eight orders of magnitude smaller than one thousandth (10⁻³). Compare zepto- comb. form, and also yotta- comb. form, zetta- comb. form.The unit prefix was officially accepted by the General Conference on Weights and Measures in 1991. On the further background compare:1994 Q. Jrnl. Royal Astron. Soc. 25 570 In 1990 the International Union of Pure and Applied Chemistry..offered for discussion a suggestion for sepo and oco, from Latin septo, seven and octo, eight. Because the symbol s for sepo would be the same as the symbol for the second, while the symbol o for oco could be misread as a zero, these eventually became zepto (10⁻²¹) and yocto (10⁻²⁴). Used in the names of units of measurement to denote a factor of 10⁻²⁴ (one million million million millionth; one thousandth to the power of eight), as yoctogram, yoctomole, yoctosecond. Symbol y. Π 1991 Rapport de la 10^e Session, Commité Consultatif des Uniés (Bureau Internat. des Poids et Mesures) u44 After further discussion along this line the CCU decided as follows:..10⁻²¹ zepto [symbol] z... 10⁻²⁴ yocto [symbol] y. 1994 New Scientist 3 Dec. 81/2 The elementary charge is 1.6 x 10⁻¹⁹ coulombs (160 zeptocoulombs) and the mass of a proton is 1.7 yoctograms. 1996 N.Y. Times Mag. 14 Jan. 12 A yoctosecond, equivalent to .000000000000000000000001—that's 23 zeros, is the smallest designated unit of time. 2004 Nature 29 July 522/2 Their mass-spectrometry approach can detect 800 yoctomoles (800 × 10⁻²⁴ moles) of des-Arg⁹-bradykinin. 2006 R. Dawkins God Delusion 155 The ‘inflation’ that physicists postulate as occupying some fraction of the first yoctosecond of the universe's existence. This is a new entry (OED Third Edition, December 2016; most recently modified version published online December 2021). < comb. form1991
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