NOUN
- a highly fissionable isotope of plutonium that is used in atomic weapons and as a reactor fuel; produced by irradiating uranium 238 with slow electrons
How To Use plutonium 239 In A Sentence
- That would leave the bulk of the bag free for the plutonium 239 and the firing mechanism John had described.
- That would leave the bulk of the bag free for the plutonium 239 and the firing mechanism John had described.
