rad

adjective

1. (slang) Excellent, short for radical.

noun

1. a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material

Definition categories: quantity

2. the unit of plane angle adopted under the Systeme International d'Unites; equal to the angle at the center of a circle subtended by an arc equal in length to the radius (approximately 57.295 degrees)

Similar word(s): radian

Definition categories: quantity