Definition of radio- in English:

radio-

Pronunciation: /ˈreɪdɪəʊ/

combining form

2.1Denoting artificially prepared radioisotopes of elements: radio-cobalt
3 Anatomy Belonging to the radius in conjunction with some other part: radio-carpal

Origin

from radio or radius.

Definition of radio- in:

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Word of the day rebuff
Pronunciation: rəˈbəf
verb
reject (someone or something) in an abrupt manner…