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Longman Dictionary of Contemporary English

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TOEFL BNC: 4241 COCA: 5184

atom

Word family

Related topics: Physics

ldoce_012_bat·om /ˈætəm/ noun [countableC]

1 HPthe smallest part of an element that can exist alone or can combine with other substances to form a molecule 原子

carbon atoms

碳原子

atom of

two atoms of hydrogen

两个氢原子

→5 See picture of neutron 中子, electron 电子, proton 质子

2 AMOUNTa very small amount of something – used for emphasis 一点儿〔用于强调〕

atom of

There isn’t an atom of truth in it.

那里面没有丝毫的真实性。

Examples from the Corpus

atom• The valency of an atom in a covalent molecule is the number of electrons shared by the atom in forming the bond.• an atom of truth• In graphite the carbon atoms are arranged in flat hexagons layered on top of each other.• Quarks unite to form protons, neutrons and electrons, which in turn unite to form atoms.• The formula also shows the number of moles of atoms of each element in one mole of molecules.• Talk of probability waves and eigen values does not undermine the reality of atoms and molecules.

Origin atom

(1500-1600) Latin atomus, from Greek, from atomos “that cannot be divided”, from temnein “to cut”

Chinese

Syllable

Corpus

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