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xi baryon

Scientific  
/ zī,sī,ksē /

  1. Either of two subatomic particles in the baryon family, one neutral and one negatively charged, with masses of 2,572 and 2,585 times that of the electron and average lifetimes of 2.9 × 10 - 10 and 1.6 × 10 - 10 seconds.

  2. See Table at subatomic particle

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Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.