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3 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 alpha particle 名詞
 α-粒子

From: Webster's Revised Unabridged Dictionary (1913)

 alpha particle. Physics & Chem. a particle emitted at high velocity from certain radioactive substances.  It is identical to the helium nucleus, consisting of two protons and two neutrons.  Rays of such particles are called alpha rays.
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From: WordNet (r) 2.0

 alpha particle
      n : a positively charged particle that is the nucleus of the
          helium atom; emitted from natural or radioactive isotopes