Pronunciation: (sen'tôr),[key] —n. 1. Class. Myth.one of a race of monsters having the head, trunk, and arms of a man, and the body and legs of a horse.
2. (cap.) Astron.the constellation Centaurus.
3. a skillful horseman or horsewoman.
4. (cap.) Rocketry.a U.S. upper stage, with a restartable liquid-propellant engine, used with an Atlas or Titan booster to launch satellites and probes.