a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
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)
例句
用作形容词 (adj.)
Have you guys seen Wendy's new place? It's so rad. 你们去看过温迪的新家了没？太好玩了。
美
[ræd]
