Definition of alpha particle noun from the Oxford Advanced Learner's Dictionary


alpha particle

BrE BrE//ˈælfə pɑːtɪkl//
; NAmE NAmE//ˈælfə pɑːrtɪkl//
(specialist) Molecules and matter
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the nucleus of a helium atom; a particle with a positive electrical charge, that is produced in a nuclear reaction See related entries: Molecules and matter
See the Oxford Advanced American Dictionary entry: alpha particle