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radio

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ra⋅di⋅o

  [rey-dee-oh] noun, plural -di⋅os, adjective, verb, -di⋅oed, -di⋅o⋅ing.
Use radio in a Sentence
–noun
1. wireless telegraphy or telephony: speeches broadcast by radio.
2. an apparatus for receiving or transmitting radio broadcasts.
3. a message transmitted by radio.
–adjective
4. pertaining to, used in, or sent by radio.
5. pertaining to or employing radiations, as of electrical energy.
–verb (used with object)
6. to transmit (a message, music, etc.) by radio.
7. to send a message to (a person) by radio.
–verb (used without object)
8. to transmit a message, music, etc., by radio.
Origin:
1910–15; shortening of radiotelegraph or radiotelegraphy
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radio-

 
a combining form with the meanings “dealing with radiant energy” (radiometer), “employing or dealing with radio waves” (radioacoustics; radiolocation; radiotelephone), “emitting rays as a result of the breakup of atomic nuclei” (radioactive; radiocarbon), “characterized by, employing or dealing with such rays” (radiography; radiopaque; radiotherapy).
Origin:
< F, comb. form repr. L radius beam, ray, radius
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
Cite This Source Link To radio
ra·di·o   (rā'dē-ō)   
n.   pl. ra·di·os

  1. The wireless transmission through space of electromagnetic waves in the approximate frequency range from 10 kilohertz to 300,000 megahertz.

  2. Communication of audible signals encoded in electromagnetic waves.

  3. Transmission of programs for the public by radio broadcast.

    1. An apparatus used to transmit radio signals; a transmitter.

    2. An apparatus used to receive radio signals; a receiver.

    3. A complex of equipment capable of transmitting and receiving radio signals.

    4. A station for radio transmitting.

    5. A radio broadcasting organization or network of affiliated organizations.

    6. The radio broadcasting industry.

    1. A station for radio transmitting.

    2. A radio broadcasting organization or network of affiliated organizations.

    3. The radio broadcasting industry.

  6. A message sent by radio.

v.   ra·di·oed, ra·di·o·ing, ra·di·os

v.   tr.

  1. To transmit by radio: radio a message to headquarters.

  2. To transmit a message to by radio: radioed the spacecraft.

v.   intr.
To transmit messages or a message by radio: a ship radioing for help.

[Short for radiotelegraphy.]
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Word Origin & History

radio 
"wireless transmission with radio waves," 1907, abstracted from earlier combinations such as radiophone (1881) and radio-telegraphy (1898), from radio-, comb. form of radiation (q.v.). Use for "radio receiver" is first attested 1917; sense of "sound broadcasting as a medium" is from 1922. Wireless remained more widespread until World War II, when military preference for radio turned the tables. The verb is attested from 1919.
Online Etymology Dictionary, © 2001 Douglas Harper
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Medical Dictionary

radio- or radi-
pref.

  1. Radiation; radiant energy: radiometer.

  2. Radioactive: radiochemistry.

  3. Radius: radiobicipital.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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