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1. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
    
2. The unit of plane angle adopted under the Système International d'Unités; equal to the angle at the centre of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)
   - radian
    
3. [informal] A person who has radical ideas or opinions
   - radical

1. Brilliant; very good
   - socko [N. Amer, informal], righteous [US, slang], fab [Brit, informal], crucial [slang], radical [N. Amer, slang], nang [Brit, slang], phat [slang], legit [US, slang], awesomesauce [informal], amazeballs [informal], beaut [Austral, NZ, informal], lit [US, slang], storming [Brit, informal], blinding [Brit, slang], stonking [Brit, informal], brill [Brit, informal], wicked [slang], cushty [Brit, informal], ace [informal], def [slang], magic [Brit, slang], smokin' [slang], smoking [slang], super [informal], sick [N. Amer, slang]

Derived forms: rads

See also: A1 [informal], ace [informal], A-one [informal], awesome [informal], beezer [UK, archaic], brilliant, crack [informal], excellent, fantabulous [informal], first-class, first-rate, lush [Brit, informal], mean [informal], outstanding, ripping [Brit, informal], splendid, stellar [informal], super, tiptop, top-drawer, topnotch [informal], top-notch [informal], tops [informal]

Type of: angular unit, individual, mortal, person, radioactivity unit, somebody, someone, soul

Encyclopedia: Rad