Dictionary.com

Popular Searches

 Thesaurus.com

eta particle

Scientific  
/ ā′tə,ē′tə /

  1. An electrically neutral meson having a mass 1,071 times that of the electron and a mean lifetime of approximately 3.5 × 10 - 8 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.