Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun rad

2 senses of rad

Sense 1
rad -- (a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material)
       => radioactivity unit -- (a measure of radioactivity)

Sense 2
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))
       => angular unit -- (a unit of measurement for angles)