Noun rad has 2 senses
  1. rad - a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
    --1 is a kind of
    radioactivity unit
  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)
    --2 is a kind of angular unit
    --2 has parts: milliradian
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