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strange particle

noun, Physics.
any elementary particle with a strangeness quantum number other than zero.
1955-60; originally so called because of the anomalously long decay time of such particles Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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strange particle in Science
strange particle  
Any of various unstable elementary particles, having a short half-life and a nonzero strangeness quantum number. Sigma and xi baryons, for example, are strange particles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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