柯林斯詞典rad /r?d/ 1. N a former unit of absorbed ionizing radiation dose equivalent to an energy absorption per unit mass of 0.01 joule per kilogram of irradiated material. 1 rad is equivalent to 0.01 gray 拉德(吸收輻射劑量單位)rad N 1. SYMBOL for radian 弧度 返回 rad劍橋詞典extremely exciting or good 極其刺激的；特棒的 a rad new computer game 非常刺激的新電腦游戲 返回 rad