an on-the-air radio campaign, often lasting 24 hours or more, designed to raise money for a radio station, charity, the arts, etc., as from listeners phoning in and pledging specific donations, sometimes in exchange for gifts or premiums.


Nearby words

  1. radiotherapeutic,
  2. radiotherapeutics,
  3. radiotherapist,
  4. radiotherapy,
  5. radiothermy,
  6. radiothorium,
  7. radiotoxemia,
  8. radiotoxic,
  9. radiotracer,
  10. radiotransparent

Compare telethon.

Origin of radiothon

1960–65, Americanism; radio + -thon Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019