Enter a clue or pattern or both:
The Clue
Geiger relative (3 letter answer)
The Answer
RAD
Tags
Notes
The answer RAD is seen frequently, appearing about once every 140 puzzles.
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Definition
RAD as a noun:
1. a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
2. (radian, rad) = 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)