[1] : The Collaborative International Dictionary of English v.0.48

radio- \ra"dio-\ r=a"di^-o-, a.
   1. of or pertaining to, or employing, or operated by, radiant
      energy, specifically that of electromagnetic waves with
      frequencies between those of infrared radiation and
      x-rays; hence, pertaining to, or employed in, broadcast
      radio or television, microwaves, radiotelephones, etc.;
      as, radio waves.
      webster 1913 suppl. +pjc

   2. of or pertaining to broadcast radio; as, a radio program.
      pjc

[2] : The Collaborative International Dictionary of English v.0.48

radio- \ra"dio-\ r=a"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, radio-muscular, radio-carpal.
   1913 webster

[3] : The Collaborative International Dictionary of English v.0.48

electronic device \electronic device\ n.
   a device depending on the principles of electronics and using
   the manipulation of electron flow for its operation.
   pjc

   note: numerous electronic devices are in daily use, among
         them the television, radio, computer, robot,
         transmitter, receiver, vcr, cd player, etc.
         pjc
see also:
television radio computer robot transmitter receiver 
vcr cd player 

[4] : WordNet (r) 2.0

radio
     adj : 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"
see also:
radiocommunication wireless radio receiver receiving set radio set tuner 

[5] : Moby Thesaurus II by Grady Ward, 1.0

155 moby thesaurus words for "radio":
   am receiver, am tuner, am-fm receiver, am-fm tuner, cb, rdf,
   teletype, wirephoto, advice, adviser, air, announce, announcer,
   annunciator, audio-frequency, authority, auto radio, automation,
   aviation radio, avionics, battery radio, beam, broadcast,
   broadcast journalism, cabinet, cable, channel, chassis,
   citizens band, communicant, communication, communicational,
   communications, communicator, console, crystal set, disseminate,
   electron microscopy, electron optics, electron physics,
   electronic engineering, electronics, electrophysics, enlightener,
   expert witness, facsimile, flash, gossipmonger, grapevine,
   heterodyne, high-frequency, housing, informant, information,
   information center, information medium, informer, intelligence,
   interviewee, journalism, line radio, magnetotelephonic,
   microtelephonic, monitor, monotelephonic, mouthpiece,
   multiplex receiver, news, news agency, news medium, news service,
   newscast, newsiness, newsletter, newsmagazine, newsmonger,
   newspaper, newsworthiness, notifier, photoelectricity,
   phototelegraphic, pocket radio, present, press, press association,
   public relations officer, publisher, radar, radiate,
   radio direction finder, radio receiver, radio set, radio telescope,
   radio-record player, radiobroadcast, radionics, radiophone,
   radiophotography, radiotelegraphic, radiotelegraphy,
   radiotelephony, railroad radio, receiver, receiving set,
   regenerative receiver, relay receiver, reportage, reporter, send,
   send a wire, set, ship-to-shore radio, shortwave, sign off,
   sign on, signal, source, spokesman, sportscast, superheterodyne,
   table radio, telecommunicational, telegram, telegraph,
   telegraph agency, telegraphic, telephonic, telephotographic,
   television, telex, teller, the fourth estate, the press,
   thermotelephonic, tidings, tipster, tout, transceiver, transistor,
   transistor physics, transmit, transmit-receiver, tuner,
   walkie-talkie, wire, wire service, wire wave communication,
   wired radio, wired wireless, wireless, wireless set,
   wireless telegraphy, wireless telephony, witness, word

Radio >> R Words
Radio, definition of term: Radio
radio_pag1.html

Radio Station >> R Words
Radio Station, definition of term: Radio Station
radio+station_pag1.html

Radio Transmitt >> R Words
Radio Transmitt, definition of term: Radio Transmitt
radio+transmitt_pag1.html

Radio Wave >> R Words
Radio Wave, definition of term: Radio Wave
radio+wave_pag1.html

Radio Spectrum >> R Words
Radio Spectrum, definition of term: Radio Spectrum
radio+spectrum_pag1.html

Radio Frequency >> R Words
Radio Frequency, definition of term: Radio Frequency
radio+frequency_pag1.html

Radio Announcer >> R Words
Radio Announcer, definition of term: Radio Announcer
radio+announcer_pag1.html

Radio Broadcast >> R Words
Radio Broadcast, definition of term: Radio Broadcast
radio+broadcast_pag1.html

Packet Radio >> P Words
Packet Radio, definition of term: Packet Radio
packet+radio_pag1.html