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eta-c meson

[ey-tuh-see, ee-tuh-]
noun Physics.
  1. a neutral meson having a mass 5832 times that of the electron and a mean lifetime of approximately 3.1 × 10-22 seconds.
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Also called eta-c particle.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018