rad

adj

1. (abbreviation, alt-of, clipping, dated, slang)Clipping of radical (“excellent”).

   “In the Guinness Book of World-fucking-Records, man… under "Raddest Fucking Dude Alive"!”

   “What is up, girly-friend? Holy shit, cuz. This is such a rad surprise.”

noun

1. A non-SI unit of absorbed dose of radiation, equal to 0.01 gray, that is, 1 centigray.

   “Near-synonyms: centigray, cGy (same physical quantity)”

2. (alt-of, symbol)Symbol for the radian, a unit of measure for angle.
3. (abbreviation, alt-of, clipping, slang)Clipping of radiator.
4. (abbreviation, alt-of, slang)Abbreviation of sight radius.
5. (abbreviation, alt-of, clipping)Clipping of radical: a political radical.

   “The women who work in it with me are all feminists, they're all rads, two of them are black belts in karate...I mean, they're major women.”

6. (abbreviation, alt-of, countable, initialism)Initialism of role activity diagram.
7. (abbreviation, alt-of, initialism, uncountable)Initialism of rapid application development.
8. (abbreviation, alt-of, countable, initialism, uncountable)Initialism of reactive attachment disorder.

name

1. (abbreviation, alt-of, initialism)Initialism of Radiation Assessment Detector, a scientific instrument of the Mars Science Laboratory onboard the Curiosity rover at Mars.
2. (abbreviation, acronym, alt-of)Acronym of River Arts District, a neighborhood of Asheville, North Carolina, United States.

   “The recovery is still a work in progress, given the deadly storm’s massive impact on people across Western North Carolina and its devastation of two popular Asheville neighborhoods — the RAD (“rad”), as locals call it, and nearby Biltmore Village.”