atto-comb. form

Stress is often attracted to this combining form, e.g. atto-second Brit.

/ˈatə(ʊ)sɛknd/, U.S.

/ˈædoʊˌsɛkən(d)/.

Origin: Formed within English, by blending. Etymons: English att- , -o- connective.

Etymology: < att- (in either Danish atten or Norwegian atten eighteen: see eighteen adj. and n.) + -o- connective. Compare femto- comb. form.

Science.

Prefixed to the name of a unit of measurement to denote a factor of 10⁻¹⁸, as attomole, atto-second, etc. Symbol a.

ΚΠ

1961 Symbols, Units & Nomencl. Physics (I.U.P.A.P.) 5 The following prefixes should be used to indicate decimal fractions or multiples of a unit..femto..f..atto..a.

1963 Nature 16 Mar. 1056/1 The International Committee [on Weights and Measures] also adopted two new prefixes for denoting sub-multiples of units. They are: femto, 10⁻¹⁵, symbol ‘f’, and atto, 10⁻¹⁸, symbol ‘a’.

1976 Nucl. Physics A. 259 13 The suitability of this technique for measuring lifetimes of nuclear bound states in the attosecond range is discussed.

1977 Lancet 1 Jan. 40/2 We can detect attomole amounts of antigens.

2001 New Scientist 24 Mar. 14/1 An attonewton is to the weight of a feather as the weight of a feather is to the weight of the Hoover dam.

2002 Nature 19/ 26 Dec. 737/1 An electron orbits a hydrogen atom in just 24 attoseconds.

This is a new entry (OED Third Edition, September 2004; most recently modified version published online December 2021).

单词	atto-
释义	atto-comb. form Stress is often attracted to this combining form, e.g. atto-second Brit. /ˈatə(ʊ)sɛknd/, U.S. /ˈædoʊˌsɛkən(d)/. Origin: Formed within English, by blending. Etymons: English att- , -o- connective. Etymology: < att- (in either Danish atten or Norwegian atten eighteen: see eighteen adj. and n.) + -o- connective. Compare femto- comb. form. Science. Prefixed to the name of a unit of measurement to denote a factor of 10⁻¹⁸, as attomole, atto-second, etc. Symbol a. ΚΠ 1961 Symbols, Units & Nomencl. Physics (I.U.P.A.P.) 5 The following prefixes should be used to indicate decimal fractions or multiples of a unit..femto..f..atto..a. 1963 Nature 16 Mar. 1056/1 The International Committee [on Weights and Measures] also adopted two new prefixes for denoting sub-multiples of units. They are: femto, 10⁻¹⁵, symbol ‘f’, and atto, 10⁻¹⁸, symbol ‘a’. 1976 Nucl. Physics A. 259 13 The suitability of this technique for measuring lifetimes of nuclear bound states in the attosecond range is discussed. 1977 Lancet 1 Jan. 40/2 We can detect attomole amounts of antigens. 2001 New Scientist 24 Mar. 14/1 An attonewton is to the weight of a feather as the weight of a feather is to the weight of the Hoover dam. 2002 Nature 19/ 26 Dec. 737/1 An electron orbits a hydrogen atom in just 24 attoseconds. This is a new entry (OED Third Edition, September 2004; most recently modified version published online December 2021). < comb. form1961
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