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2017 Word of the Year

sigma particle

noun, Physics.
1.
an unstable hyperon having positive, negative, or zero electric charge and strangeness −1. Symbol: Σ.
Also called sigma baryon.
Origin of sigma particle
1960-1965
First recorded in 1960-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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8
10
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