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According to WordNet, the noun "rad" has 2 sense(s).
113646557 a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material.
SUMO Mappings: Rad (equivalent mapping)
113612042 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).
SUMO Mappings: Radian (equivalent mapping)
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