alpha particle Definition in the Cambridge English Dictionary
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Definition of “alpha particle” - English Dictionary

Definition of "alpha particle" - American English Dictionary

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alpha particlenoun [C]

 /ˈæl·fə ˌpɑr·t̬ɪ·kəl /
physics a very ​smallunit of ​matter with a ​positiveelectrical charge that is ​sent out by some radioactivesubstances
(Definition of alpha particle from the Cambridge Academic Content Dictionary © Cambridge University Press)

Definition of "alpha particle" - British English Dictionary

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alpha particlenoun [C]

uk   us   specialized
an ​extremelysmallpiece of ​matter with a ​positiveelectrical charge, ​produced when a radioactiveatom is ​broken down, usually in a ​nuclearreaction
(Definition of alpha particle from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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