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neutron

noun
🔊/ˈnjuːtrɒn/
🔊/ˈnuːtrɑːn/
 (physics物理)
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  1. a very small piece of matter (= a substance) that carries no electric charge and that forms part of the nucleus (= central part) of an atom 中子see also electron, proton
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    Topics Physics and chemistryc2
    Oxford Collocations DictionaryNeutron is used before these nouns:
    • bomb
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    Word Originearly 20th cent.: from neutral + -on.