- a unit of absorbed dose of radiation equal to 0.01 gray: not a standard SI unit, the rad is still used, especially in the U.S., but it is increasingly disfavored.
- a radical, especially a person with extreme views on political and social issues.
- excellent; wonderful; cool: a high speed, high energy, totally rad racing game.
- radian; radians.
- radical.
- radix.
- 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
- radian
- radical
- radius
