rad   (TTS Sound)

The noun rad has 2 senses

• rad -- (a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material)


• radian, rad -- (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))