rad
英[r?d]
美[r?d]
- n. 拉德（輻射劑量單位）
- n. (Rad)人名；(塞、羅、德)拉德
英英釋意
- 1. a unit of absorbed ionizing radiation equal to 100 ergs per gram of irradiated material
- 2. 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)