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

  • adj. Of, exhibiting, or caused by radioactivity.
  • adj. Informal Extremely sensitive or controversial: "Perhaps race is now too radioactive a topic, in an era of political correctness” ( David Nyhan).

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. Exhibiting radioactivity.

from the GNU version of the Collaborative International Dictionary of English

  • adj. Capable of luminescence under the action of cathode rays, X rays, or any of the allied forms of radiation.
  • adj. of, exhibiting, or caused by radioactivity.

from The Century Dictionary and Cyclopedia

  • Exhibiting or pertaining to radioactivity (which see): as, radioactive substances.

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

  • adj. exhibiting or caused by radioactivity


Sorry, no etymologies found.



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