![radioisotope radioisotope](https://www.tekportal.net/wp-content/uploads/2018/11/radioisotope.png)
noun
- a radioactive isotope, usually artificially produced: used in physical and biological research, therapeutics, etc.
noun
- an isotope that is radioactive
n.
- A naturally or artificially produced radioactive isotope.
- A radioactive isotope of a chemical element. Carbon 14 and radon 222 are examples of naturally occurring radioactive isotopes.