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rad
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…
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ɹæd
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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)
noun
a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
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