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strange B meson

American  

noun

  1. Physics. a meson with a neutral electrical charge, a mass of 10,507 times that of the electron, and a mean lifetime of approximately 1.6 × 10-12 seconds.

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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.