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Alpha particle

noun

Definitions

Noun
  1. 1
    A doubly positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity.

    "Holonyms: alpha ray, alpha radiation"

  2. 2
    a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes wordnet

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