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Definition of positron noun from the Oxford Advanced Learner's Dictionary

positron

noun

/ˈpɒzɪtrɒn/

/ˈpɑːzɪtrɑːn/

(physics)

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a particle in an atom which has the same mass as an electron and an equal but positive charge
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Word Origin1930s: from positive + -tron.

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See positron in the Oxford Advanced American Dictionary

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