| a negative baryon having a mass 3272 times that of the electron and a mean lifetime of 8 X 10-11 seconds. |
| omega baryon n. A subatomic particle in the baryon family having a mass 3,272 times that of the electron, a unit negative electron charge, and an average lifetime of 8 × 10-11 seconds. Also called omega. See Table at subatomic particle. |