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
Word origin
C20: shortened from radiation
rad in British English2
symbol for
radian
radian in British English2
(ˈreɪdɪən)
noun
an SI unit of plane angle; the angle between two radii of a circle that cut off on the circumference an arc equal in length to the radius. 1 radian is equivalent to 57.296 degrees and π/2 radians equals a right angle
Symbol: rad
rad. in British English
abbreviation for
1.
radical
2.
radius
rad in American English1
(ræd)
noun
a basic unit of an absorbed dose of radiation, equal to the absorption of 100 ergs of energy per gram of material or 0.01 joule per kilogram of material (0.01 gray or 1.1 roentgen)
Word origin
< radiation
rad in American English2
1.
radian(s)
2.
radical
3.
radius
4.
radix
Examples of 'rad' in a sentence
rad
The next logical place on the site was Building One, and Stoner sent a team inside with their rad meters and a video cam.
Dale Brown and Jim DeFelice DALE BROWN'S DREAMLAND (5) STRIKE ZONE (2004)