Word.ws English Dictionary

radio-

Syllables: ra·di·o-

radio- prefix: radiation, radioactive.

Prefix

radio-

  1. radiation, radioactive
    • e.g. radiotherapy, radioactinium, radiolucent
  2. radio (broadcasting)
    • e.g. radiotelemetry, radioacoustics, radiotelegraph
  3. radius (bone)
    • e.g. radiobicipital
  4. radius
    • e.g. radiosymmetrical

Forms of radio-

alternative formradi-
alternative formrad-

Origin of radio-

Derived from Latin radius (“ray”). By surface analysis, clipping of radiation + -o-.

Words formed from radio-

Questions about radio-

What does radio- mean?
Radio- means radiation, radioactive.
What part of speech is radio-?
Radio- is a prefix.

Words near radio- in the dictionary

  1. radio transmitters
  2. radio wave
  3. radio waves
  4. Radio Yerevan
  5. radio'd
  6. radio-
  7. radio-active
  8. radio-activity
  9. radio-beacon
  10. radio-beacons
  11. radio-bright

Source and license

Adapted from Wiktionary: radio- (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: LL-Q1860 (eng)-Flame, not lame-radio-.wav.

Cite this entry: “radio-.” Word.ws, https://word.ws/radio-. Based on Wiktionary, CC BY-SA 4.0.