from The American HeritageĀ® Dictionary of the English Language, 4th Edition

  • Radiation; radiant energy: radiometer.
  • Radioactive: radiochemistry.
  • Radio: radiotelephone.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • radiation
  • radio (broadcasting)
  • radius (bone)

from the GNU version of the Collaborative International Dictionary of English

  • A combining form indicating connection with, or relation to, a radius or ray; specifically (Anat.), with the radius of the forearm.
  • adj. 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..
  • adj. of or pertaining to broadcast radio.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • adj. indicating radiation or radioactivity
  • n. an electronic receiver that detects and demodulates and amplifies transmitted signals
  • n. a communication system based on broadcasting electromagnetic waves
  • v. transmit messages via radio waves
  • n. medium for communication


From radiation.
(American Heritage® Dictionary of the English Language, Fourth Edition)
Latin radiusĀ ("ray") (Wiktionary)


  • Ionizing radiation such as the kind emitted by UV rays or X-rays breaks chemical bonds and releases ions whereas non-ionising radiation, such as radio- or microwaves, cannot break chemical bonds but can produce other effects on matter, such as heat.

    CBC | Top Stories News

  • Crestview, a New York-based private-equity firm, created a strategic partnership with Cumulus in April to invest in radio- broadcasting companies. -- Top News

  • March 10 Bloomberg -- Cumulus Media Inc., the U.S. radio- station owner, offered to buy larger rival Citadel Broadcasting Corp. in a deal worth $2.4 billion to expand its coverage and cut costs, ending months of negotiations. -- Top News

  • Today, Cory Booker, the African American mayor of the City of Newark, New Jersey, was on the radio- WFAN. Top headlines

  • The procedure could also benefit boys with cancer who are too young to produce sperm but are at risk of being made infertile by radio- or chemotherapy.

    The Guardian World News


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  • Radio- (Page: 1183)

    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.

    ARTFL Project: Webster Dictionary, 1913

    March 12, 2011