nuclear rocket

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun astronautics A rocket with a nuclear reactor aboard.
• noun astronautics A rocket where a nuclear process, especially an on-board fission reactor, enables thrust to be produced.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a rocket engine in which a nuclear reactor is used to heat a propellant