English noun: rad | |||
1. | rad (quantity) a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material | ||
Broader (hypernym) | radioactivity unit | ||
2. | rad (quantity) 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) | ||
Synonyms | radian | ||
Broader (hypernym) | angular unit | ||
Part holonym | milliradian | ||