radi-

combining form

variants or radio-

1

: radiant energy : radiation

radioactive

radiopaque

2

: radioactive

radioelement

3

: radium : X-rays

radiotherapy

4

: radioactive isotopes especially as produced artificially

radiocarbon

5

: radio

radiotelegraphy

6

: radius bone

radio-ulna

Word History

Etymology

French, from Latin radius ray