positron - WordReference.com Dictionary of English

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positron

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Concise Oxford English Dictionary © 2008 Oxford University Press:
positron /ˈpɒzɪtrɒn/

▶noun Physics a subatomic particle with the same mass as an electron and a numerically equal but positive charge.

– origin 1930s: from positive + -tron.

'positron' also found in these Oxford entries:

antiparticle - electron pair - pair production - PET - -tron

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