Meaning of baryon number

bar'yon num"ber

Pronunciation: [key]
— Physics. Physics.
  1. a quantum number assigned to elementary particles, baryons having baryon number 1, antibaryons −1, and all other observable particles 0; quarks have baryon number 1/3 and antiquarks −1/3. Cf. conservation of baryon number.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.