rad

1. (noun) a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
Related Words: radioactivity unit

2. (noun) the unit of plane angle adopted under the System 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)
Synonyms: radian
Related Words: angular unit



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