alpha particle

/ˈpɑrdəkəl/
IPA guide

Other forms: alpha particles

Definitions of alpha particle
  1. noun
    a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
    see moresee less
    type of:
    particle, subatomic particle
    a body having finite mass and internal structure but negligible dimensions
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