Top definition
a radioactive isotope of a normally non-radioactive element. Can be produced artificially, by bombarding the element in question's nucleus with neutrons. This increases the number of neutrons in the nucleus to an unstable number.
Radioisotopes also occur naturally.
Carbon-14 is a radioisotope.
by PrivateDonut February 10, 2005
Mug icon

The Urban Dictionary Mug

One side has the word, one side has the definition. Microwave and dishwasher safe. Lotsa space for your liquids.

Buy the mug