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neutron

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neutron/ˈnuːˌtrɑːn/
British/ˈnjuːˌtrɒn/noun
pluralneutrons
neutron
/ˈnuːˌtrɑːn/British/ˈnjuːˌtrɒn/
noun
pluralneutrons
Learner's definition of NEUTRON  
[count]physics
: a very small particle of matter that has no electrical charge and is part of the nucleus of all atoms except hydrogen atoms
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