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    rad - Dictionary definition and meaning for word rad

    (noun) a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material Definition
    (noun) 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)
    Synonyms : radian
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