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strange particle

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strange particle

–noun Physics.
any elementary particle with a strangeness quantum number other than zero.

Origin:
1955–60; originally so called because of the anomalously long decay time of such particles
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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strange particle  
n.  An unstable elementary particle created in high-energy particle collisions having a short life and a strangeness quantum number other than zero.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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