rad Meaning, Definition & Usage

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

WordNet

Rad
Definitions
obs.
  1. imp. & p. p. of Read, Rede. Spenser.

Webster 1913