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RAD
Rad (noun) — a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material. 2. (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).
Rad is a valid 3-letter word worth 4 points in Scrabble (and Words With Friends letter values vary). Below are its anagrams and the shorter words hidden inside it.