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upsilon particle

Scientific  
/ ŭp′sə-lŏn′,yo̅o̅p′- /

  1. An electrically neutral meson having a mass 18,513 times that of the electron and a mean lifetime of approximately 8.0 × 10 - 20 seconds.

  2. See Table at subatomic particle

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

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