rad

Noun
  1. A unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material (synset 113668175)
    is a type of: radioactivity unit - a measure of radioactivity
  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) (synset 113633285)
    is a type of: angular unit - a unit of measurement for angles
    has: milliradian - a unit of angular distance equal to one thousandth of a radian
    same as: radian

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