URANIUM 238

 I. (noun) 

Sense 1

Meaning:

The commonest isotope of uranium; it is not fissionable but when irradiated with neutrons it produces fissionable plutonium 239

Classified under:

Nouns denoting substances

Hypernyms ("uranium 238" is a kind of...):

atomic number 92; U; uranium (a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons)

Credits