rad

noun5

1. •
   A non-SI unit of absorbed dose of radiation, equal to 0.01 gray, that is, 1 centigray.
2. •
   Symbol for the radian, a unit of measure for angle.
3. •
   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. — 1991
4. •
   (slang) Clipping of radiator.
5. •
   (slang) Abbreviation of sight radius.

adjective1

1. •
   (slang, old-fashioned) Clipping of radical (“excellent”).

   • In the Guinness Book of World-fucking-Records, man… under "Raddest Fucking Dude Alive"! — 2002

noun1

1. •
   Abbreviation of radian.

noun4

1. •
   Initialism of reactive attachment disorder.
2. •
   Initialism of rapid application development.
3. •
   Initialism of role activity diagram.
4. •
   Acronym of River Arts District, a neighborhood of Asheville, North Carolina, United States.