- the radioactive uranium isotope having a mass number 238, comprising 99.28 percent of natural uranium: used chiefly in nuclear reactors as a source of the fissionable isotope plutonium 239.
More Definitions
- ADDITIONAL MEMBER SYSTEM (noun) Definition, Meaning & Examples
- ERRONEOUS (noun) Definition, Meaning & Examples
- POLYDRUG (noun) Definition, Meaning & Examples
- TRAINBAND (noun) Definition, Meaning & Examples
- EAST GERMANIC (noun) Definition, Meaning & Examples
- RETAIL (noun) Definition, Meaning & Examples
