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Related to rho meson: omega meson
Any of a group of three vector mesons having a positive, neutral, or negative electric charge and a mass 1,518 times that of the electron and a mean lifetime of about 4 × 10-24 second.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.