femto-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. If the subsequent element is an existing word, it is likely to retain its original stress pattern, e.g. femtomolar Brit.

/ˌfɛmtə(ʊ)ˈməʊlə/, U.S.

/ˌfɛmtoʊˈmoʊlər/.

Origin: A borrowing from Danish, combined with an English element. Etymons: Danish femten , -o suffix.

Etymology: < femt- (in Danish femten: see fifteen adj.) + -o suffix.With the specific use in sense 1 compare the following:1961 Symbols, Units & Nomencl. Physics (Internat. Union Pure & Appl. Physics) 5 (heading) The following prefixes should be used to indicate decimal fractions or multiples of a unit... Femto.1963 Nature 16 Mar. 1056/1 The International Committee [on Weights and Measures]..adopted two new prefixes for denoting submultiples of units. They are: femto, 10⁻¹⁵, symbol ‘f’.

1. Prefixed to the name of a unit of measurement to denote a factor of 10⁻¹⁵ (one thousand-million-millionth), as femtoampere, femtogram, etc. Also: forming corresponding adjectives, as femtomolar. Symbol f.See also femtosecond n.

ΚΠ

1963 Electronics 5 Apr. 33 (heading) Tunnel diode detects currents down to 100 femtoamperes.

1976 Pop. Mech. Nov. 186/3 The new measurements will be stated in decibels above one femtowatt (dBf), rather than in femtowatts themselves.

1988 Mouse News Let. Nov. 84 We have developed a highly sensitive biochemical microassay for ADA which is capable of detecting femtomolar amounts of reaction product.

1994 Sci. Amer. Jan. 14/1 Frosty femtokelvin (quadrillionths of a degree) temperatures may yet be within reach.

1995 Economist 14 Oct. 146/3 Their shovel can scrape up a femtogram—about 10,000 molecules—of a material such as paraffin wax.

2000 Nature 10 Feb. 581/1 The collisions create temperatures 100,000 times hotter than the centre of the Sun, and the highest energy densities (3–4 GeV per cubic femtometre) ever reached over a large volume in laboratory experiments.

2010 PC Pro May 140/2 Wherever a stripe crosses one below it forms a capacitor so small it's measured in femtofarads (10⁻¹⁵F).

2. Prefixed to nouns, denoting dimensions of the order of 1 to 100 femtometres. Also (chiefly colloquial): prefixed to nouns with the sense ‘extremely small’.

ΚΠ

1978 J. McN. Sieburth et al. in Limnol. & Oceanogr. 23 1261/1 The size fractions occupied by the bacterioplankton (0.2–2.0 μm) and virioplankton (0.02–0.2 μm) have been termed picoplankton and femtoplankton.

1998 J. Meaney To Hold Infinity iii. 36 Thanks to her femtocytes and the shugyo—austere discipline—of her physical training, she could pass in low light for someone under forty.

2002 F. Close et al. Particle Odyssey ix. 168 But whereas the photons are free to travel indefinitely through space, gluons appear to be free only within the confines of a ‘femtouniverse’—a region some 10⁻¹⁵ m, or 1 femtometre, in radius. This is the typical size of a particle such as a proton or pion.

2004 Nature 30 Sept. 524/3 I. F. Lyuksyutov et al. describe a diamagnetic levitation system that can process droplets that are a billion times smaller—femtodroplets.

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

单词	femto-
释义	femto-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. If the subsequent element is an existing word, it is likely to retain its original stress pattern, e.g. femtomolar Brit. /ˌfɛmtə(ʊ)ˈməʊlə/, U.S. /ˌfɛmtoʊˈmoʊlər/. Origin: A borrowing from Danish, combined with an English element. Etymons: Danish femten , -o suffix. Etymology: < femt- (in Danish femten: see fifteen adj.) + -o suffix.With the specific use in sense 1 compare the following:1961 Symbols, Units & Nomencl. Physics (Internat. Union Pure & Appl. Physics) 5 (heading) The following prefixes should be used to indicate decimal fractions or multiples of a unit... Femto.1963 Nature 16 Mar. 1056/1 The International Committee [on Weights and Measures]..adopted two new prefixes for denoting submultiples of units. They are: femto, 10⁻¹⁵, symbol ‘f’. 1. Prefixed to the name of a unit of measurement to denote a factor of 10⁻¹⁵ (one thousand-million-millionth), as femtoampere, femtogram, etc. Also: forming corresponding adjectives, as femtomolar. Symbol f.See also femtosecond n. ΚΠ 1963 Electronics 5 Apr. 33 (heading) Tunnel diode detects currents down to 100 femtoamperes. 1976 Pop. Mech. Nov. 186/3 The new measurements will be stated in decibels above one femtowatt (dBf), rather than in femtowatts themselves. 1988 Mouse News Let. Nov. 84 We have developed a highly sensitive biochemical microassay for ADA which is capable of detecting femtomolar amounts of reaction product. 1994 Sci. Amer. Jan. 14/1 Frosty femtokelvin (quadrillionths of a degree) temperatures may yet be within reach. 1995 Economist 14 Oct. 146/3 Their shovel can scrape up a femtogram—about 10,000 molecules—of a material such as paraffin wax. 2000 Nature 10 Feb. 581/1 The collisions create temperatures 100,000 times hotter than the centre of the Sun, and the highest energy densities (3–4 GeV per cubic femtometre) ever reached over a large volume in laboratory experiments. 2010 PC Pro May 140/2 Wherever a stripe crosses one below it forms a capacitor so small it's measured in femtofarads (10⁻¹⁵F). 2. Prefixed to nouns, denoting dimensions of the order of 1 to 100 femtometres. Also (chiefly colloquial): prefixed to nouns with the sense ‘extremely small’. ΚΠ 1978 J. McN. Sieburth et al. in Limnol. & Oceanogr. 23 1261/1 The size fractions occupied by the bacterioplankton (0.2–2.0 μm) and virioplankton (0.02–0.2 μm) have been termed picoplankton and femtoplankton. 1998 J. Meaney To Hold Infinity iii. 36 Thanks to her femtocytes and the shugyo—austere discipline—of her physical training, she could pass in low light for someone under forty. 2002 F. Close et al. Particle Odyssey ix. 168 But whereas the photons are free to travel indefinitely through space, gluons appear to be free only within the confines of a ‘femtouniverse’—a region some 10⁻¹⁵ m, or 1 femtometre, in radius. This is the typical size of a particle such as a proton or pion. 2004 Nature 30 Sept. 524/3 I. F. Lyuksyutov et al. describe a diamagnetic levitation system that can process droplets that are a billion times smaller—femtodroplets. This entry has been updated (OED Third Edition, March 2012; most recently modified version published online March 2022). < comb. form1963
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