noun
- Plural of promethium; a radioactive chemical element with atomic number 61, used in nuclear batteries and luminous paints.
Usage: chemistry; technical
Examples
- Promethiums are rare earth elements produced in nuclear reactors.
- The laboratory stored several samples of promethiums for research purposes.
- Promethiums have applications in spacecraft power systems due to their radioactive decay.
- Scientists studied the properties of different promethiums isotopes.
- Promethiums were used in vintage watch dials to create self-luminous displays.