Usually means: Helium nuclei, two protons, neutrons.
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We found 15 dictionaries that define the word alpha particles:

General (8 matching dictionaries)
  1. alpha particles: Merriam-Webster
  2. alpha particles: Collins English Dictionary
  3. alpha particles: Vocabulary.com
  4. alpha particles: Cambridge Advanced Learner's Dictionary
  5. alpha particles: Wiktionary
  6. alpha particles: Dictionary.com
  7. Alpha particles: Wikipedia, the Free Encyclopedia
  8. Alpha particles: TheFreeDictionary.com

Business (1 matching dictionary)
  1. Alpha particles: Financial dictionary

Computing (1 matching dictionary)
  1. Alpha-particles, Alpha particles: Encyclopedia

Medicine (4 matching dictionaries)
  1. alpha particles: Merriam-Webster Medical Dictionary
  2. Medical Dictionary (No longer online)
  3. online medical dictionary (No longer online)
  4. Alpha-particles, Alpha particles: Medical dictionary

Science (1 matching dictionary)
  1. Alpha Particles: Extragalactic Astronomy

(Note: See alpha_particle as well.)

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Definitions from Wiktionary (alpha particle)

▸ noun:  (physics) A doubly positively charged nucleus of a helium-4 atom (consisting of two protons and two neutrons), emitted as a consequence of radioactivity; α-particle
▸ Also see alpha_particle


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