Alpha Particle Definition
noun
A positively charged subatomic particle, composed of two protons and two neutrons, identical with the nucleus of the helium isotope He-4.
American Heritage
A positively charged particle given off by certain radioactive substances: it consists of two protons and two neutrons (a helium nucleus), and is converted into an atom of helium by the acquisition of two electrons.
Webster's New World
A positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity; α-particle.
Wiktionary
Synonyms:
Other Word Forms of Alpha Particle
Noun
Singular:
alpha particle
Plural:
alpha-particles
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