Longman Dictionary of Contemporary English homepage

Date: 1800-1900
Origin: electro- + -on (as in ion)

electron

 noun
     
Related topics: Physics
e‧lec‧tron [countable]
HP a very small piece of matter with a negative electrical charge that moves around the nucleus (=central part) of an atom [↪ proton, neutron]
Definition from the Longman Dictionary of Contemporary English
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