deuterium
/duːˈtɪriəm/
noun
- A stable isotope of hydrogen with one proton and one neutron in its nucleus, used in nuclear reactions and scientific research.
- Scientists use deuterium to trace the movement of water in the environment.
- Nuclear power plants can use deuterium as a fuel in fusion reactions.
- Deuterium is sometimes called heavy hydrogen because it is twice as heavy as ordinary hydrogen.