rad

Etymology

adj

  1. (slang, dated) Clipping of radical; excellent
    In the Guinness Book of World-fucking-Records, man… under "Raddest Fucking Dude Alive"! 2002, Brent Goldberg, David Wagner, Van Wilder (motion picture), spoken by Wasted Guy (Aaron Paul)
    What is up, girly-friend? Holy shit, cuz. This is such a rad surprise. 2011, Diablo Cody, Young Adult (motion picture), spoken by Wheelchair Mike (John Forest)

noun

  1. (metrology) A non-SI unit of absorbed dose of radiation, equal to 0.01 gray.
    Coordinate term: gray
  2. Abbreviation of radian.
  3. (automotive, plumbing, slang) Abbreviation of radiator.
  4. (firearms, slang) Abbreviation of sight radius.

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