1. a number equal to the difference between the number of baryons and the number of antibaryons in any subatomic structure; it is conserved in all types of particle interactions;
WordNet (r) 3.0 (2006):
baryon number
n 1: a number equal to the difference between the number of
baryons and the number of antibaryons in any subatomic
structure; it is conserved in all types of particle
interactions