Definition: radio

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Source: WordNet (r) 1.7 

radio
     adj : (combining form) indicating radiation or radioactivity;
           "radiochemistry"
     n 1: medium for communication [syn: radiocommunication, wireless]
     2: an electronic receiver that detects and demodulates and
        amplifies transmitted signals [syn: radio receiver, receiving
        set, radio set, tuner, wireless]
     3: a communication system based on broadcasting electromagnetic
        waves [syn: wireless]
     v : transmit messages via radio waves; "he radioed for help"

Source: Webster's Revised Unabridged Dictionary (1913) 

Radio \Ra"di*o\, a.
   Of or pertaining to, or employing, or operated by, radiant
   energy, specifically that of electric waves; hence,
   pertaining to, or employed in, radiotelegraphy.
Radio- \Ra"di*o-\
   A combining form indicating connection with, or relation to,
   a radius or ray; specifically (Anat.), with the radius of the
   forearm; as, radio-ulnar, radiomuscular, radiocarpal.