r 1 a 1 d 2 s 1
4 letters · 5 points in Scrabble
Meaning
noun a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
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)