| a protonlike baryon containing a b quark; a neutral baryon with a mass 11,000 times that of the electron and a mean lifetime of approximately 1.1 X 10-12 seconds. |
lamb·da-b baryon  (lām'də-bē') n. An electrically neutral baryon having a mass 11,000 times that of the electron and a mean lifetime of approximately 1.1 × 10-12 seconds. See Table at subatomic particle. |
dəˈbi