Meaning of “beta particle” in the English Dictionary

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"beta particle" in American English

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beta particlenoun [ C ]

/ˈbeɪ·t̬ə ˌpɑr·t̬ɪ·kəl/
beta (+) particle also beta (–) particle chemistry, physics

an extremely small piece of matter with a positive or negative electric charge, produced when an atom is broken down. A beta (+) particle is the same as a positron; a beta (–) particle is an electron.

(Definition of “beta particle” from the Cambridge Academic Content Dictionary © Cambridge University Press)