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Meaning of Z-zero particle

Z'-ze'ro par"ticle

Pronunciation: (zē'zēr'ō), [key]
— Physics. Physics.
  1. one of three particles, called intermediate vector bosons, that are believed to transmit the weak force. Symbol: Z
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.