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Definition of "rad" []

  • A unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joules per kilogram of irradiated material. It has been replaced as a standard scientific unit by the gray. (noun)
  • Slang Excellent; wonderful. (adjective)
  • Radian (abbreviation)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Use "rad" in a sentence
  • "By the way, is _radix_ perhaps derived from [Sanskrit: rad] (_rad_), a tooth (from the fang-like form of roots), whence _rodere_ and possibly _radius_?"
  • "While the word rad is completely outdated it totally applies to this cake."
  • "However, I wouldn't call it rad, simply because I wouldn't call anything rad -- never have and never will use that word."