Nearby words

  1. radiectomy,
  2. radiguet,
  3. radii,
  4. radin,
  5. radin, paul,
  6. radio astronomy,
  7. radio beacon,
  8. radio beam,
  9. radio car,
  10. radio collar

Origin of radio

1910–15; shortening of radiotelegraph or radiotelegraphy

Related formspre·ra·di·o, adjective


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 of radio-

< French, combining form representing Latin radius beam, ray, radius Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for radio

British Dictionary definitions for radio


noun plural -os

the use of electromagnetic waves, lying in the radio-frequency range, for broadcasting, two-way communications, etc
Also called (esp Brit): wireless an electronic device designed to receive, demodulate, and amplify radio signals from sound broadcasting stations, etc
a similar device permitting both transmission and reception of radio signals for two-way communications
the broadcasting, content, etc, of sound radio programmeshe thinks radio is poor these days
  1. the occupation or profession concerned with any aspect of the broadcasting of sound radio programmeshe's in radio
  2. (modifier)relating to, produced for, or transmitted by sound radioradio drama
  1. of, relating to, employed in, or sent by radio signalsa radio station
  2. of, concerned with, using, or operated by radio frequenciesradio spectrum
(modifier) (of a motor vehicle) equipped with a radio for communicationradio car

verb -os, -oing or -oed

to transmit (a message) to (a person, radio station, etc) by means of radio waves

Word Origin for radio

C20: short for radiotelegraphy


combining form

denoting radio, broadcasting, or radio frequencyradiogram
indicating radioactivity or radiationradiochemistry; radiolucent
indicating a radioactive isotope or substanceradioactinium; radiothorium; radioelement

Word Origin for radio-

from French, from Latin radius ray; see radius

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for radio
Online Etymology Dictionary, © 2010 Douglas Harper

Medicine definitions for radio



Radiation; radiant energy:radiometer.

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

Science definitions for radio




The equipment used to generate, alter, transmit, and receive radio waves so that they carry information.


Relating to or involving the emission of radio waves.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.