from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. An electrically neutral baryon having a mass 2,183 times that of the electron and a mean lifetime of approximately 2.6 × 10-10 seconds. Also called lambda particle. See Table at subatomic particle.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any of three particles, having no electric charge and an isotopic spin of 1, composed of an up quark, down quark and either a strange quark, a charm quark or a bottom quark


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