Lõhustuv või fertiilne aine, mida kasutatatakse tuumareaktorites tuumalõhustumise ahelreaktsioonide abil energia tootmiseks.
material containing fissile nuclides which, when placed in a reactor, enables a self-sustaining nuclear chain reaction to be achieved
fissionable material that has been enriched to a composition that will support a self-sustaining fission chain reaction when used to fuel a nuclear reactor, thereby producing energy (usually in the form of heat or useful radiation) for use in other processes
Fissionable nuclear material in the form of fabricated elements for loading into the reactor core of a civil nuclear power plant or research reactor
Sobivad sõnakujud on nii tuumkütus kui ka tuumakütus. Erialakeeles on kasutusel nimetavalise esiosaga kuju tuumkütus, lähtudes põhimõttest liita olulist tunnust märkivaid sõnu nimetavaliselt (vrd gaaskütus, tolmkütus).
