- Physics. fissile or fertile material that undergoes fission in a nuclear reactor.
- any light element, as hydrogen or helium, that undergoes fusion and gives off energy within the interior of stars.
Origin of nuclear fuel
First recorded in 1945–50
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- a fuel that provides nuclear energy, used in nuclear power stations, nuclear submarines, etc