ra·di·o·i·so·tope 
(rā′dē-ō-īsə-tōp′)
(rā′dē-ō-īsə-tōp′)n.
A naturally or artificially produced radioactive isotope of an element.
- forced march
- force-feed
- force field
- forceful
- forcefully
- forcefulness
- force hand
- force majeure
- force-march
- forcemeat
- force of habit
- force on
- force oneself on
- force (oneself) on/upon
- force oneself upon
- force-out
- force play
- forceps
- force pump
- forcer
- for certain
- force (someone's) hand
- force someone's hand
- force upon
- forcible