from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun An electrically neutral baryon containing a strange quark and having a mass 2,183 times that of the electron and a mean lifetime of about 2.6 × 10−10 second.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun physics 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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