zepto-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. zeptosecond Brit.

/ˈzɛptə(ʊ)ˌsɛknd/, U.S.

/ˈzɛptoʊˌsɛk(ə)n(d)/.

Origin: A variant or alteration of another lexical item. Etymon: Latin septi-.

Etymology: An arbitrary alteration of classical Latin septi- septi- comb. form¹ (compare -o- connective); so called with reference to the unit being seven orders of magnitude smaller than one thousandth (10⁻³). Compare yocto- 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).

Prefixed to the names of units of measurement to denote a factor of 10⁻²¹ (one thousand million million millionth; one thousandth to the power of seven), as zeptogram, zeptosecond, etc. Symbol z. Also: forming corresponding adjectives, as zeptomolar.

ΚΠ

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 zeptocoloumbs) and the mass of a proton is 1.7 yoctograms.

2000 Adv. Chromatrogr. 40 281 A unit density particle of 2nm diameter weighs a zeptogram.

2001 Scientist (Nexis) 14 May 20 The signal is then detected (limit in the low zeptomolar range) by the two detectors of the Odyssey IR Imager.

2011 S. P. Hau-Riege High-intensity X-rays vi. 159 Even bandwidth-limited x-ray pulses are not sufficiently short to resolve motion within nuclei that occurs even faster on the time scale of zeptoseconds.

This is a new entry (OED Third Edition, December 2016; most recently modified version published online March 2022).

单词	zepto-
释义	zepto-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. zeptosecond Brit. /ˈzɛptə(ʊ)ˌsɛknd/, U.S. /ˈzɛptoʊˌsɛk(ə)n(d)/. Origin: A variant or alteration of another lexical item. Etymon: Latin septi-. Etymology: An arbitrary alteration of classical Latin septi- septi- comb. form¹ (compare -o- connective); so called with reference to the unit being seven orders of magnitude smaller than one thousandth (10⁻³). Compare yocto- 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). Prefixed to the names of units of measurement to denote a factor of 10⁻²¹ (one thousand million million millionth; one thousandth to the power of seven), as zeptogram, zeptosecond, etc. Symbol z. Also: forming corresponding adjectives, as zeptomolar. ΚΠ 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 zeptocoloumbs) and the mass of a proton is 1.7 yoctograms. 2000 Adv. Chromatrogr. 40 281 A unit density particle of 2nm diameter weighs a zeptogram. 2001 Scientist (Nexis) 14 May 20 The signal is then detected (limit in the low zeptomolar range) by the two detectors of the Odyssey IR Imager. 2011 S. P. Hau-Riege High-intensity X-rays vi. 159 Even bandwidth-limited x-ray pulses are not sufficiently short to resolve motion within nuclei that occurs even faster on the time scale of zeptoseconds. This is a new entry (OED Third Edition, December 2016; most recently modified version published online March 2022). < comb. form1991
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