or radio- combining form Etymology: French, from Latin radius ray radiant energy ; radiation , radioactive , radium ; X-rays , radioactive isotopes especially as produced artificially , radio , radius bone
RADI-
Meaning of RADI- in English
Merriam Webster. Explanatory English dictionary Merriam Webster. Толковый словарь английского языка Мерриам-Уэбстер. 2012