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eta-c particle

Scientific  
/ ā′tə-sē′,ē′tə- /

  1. An electrically neutral meson having a mass 5,832 times that of the electron and a mean lifetime of approximately 3.1 × 10 - 22 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.