Alpha Particle - MSN Encarta

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Alpha particle - Wikipedia, the free encyclopedia
Alpha particles (named after and denoted by the first letter in the Greek alphabet, α) consist of two protons and two neutrons bound together into a particle identical to a helium ...
bit rot from FOLDOC
alpha particle ==> bit rot < jargon > A hypothetical disease the existence of which has been deduced from the observation that unused programs or features will often stop working ...
Definition: alpha particle from Online Medical Dictionary
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Alpha Particle, positively charged nuclear particle, symbol a, consisting of two protons bound to two neutrons. Alpha particles are emitted spontaneously in some types of radioactive decay. They consist of completely ionized helium-4 atoms (see Ionization).