rad
nounA unit of energy absorbed from ionizing radiation, equal to 100 ergs per gram or 0.01 joule per kilogram of irradiated material. It has been replaced as a standard scientific unit by the gray.
abbreviationradian
adjectiveExcellent; wonderful.
Afraid; frightened.
A Middle English form of
A Middle English preterit of
An obsolete preterit of
A radical.
nounIn photometry, a proposed unit of quantity of light equal to the amount of energy in luminous form obtained in one second from a light-flux of one lumen. The rad is of a lumen-hour.
nouna unit of measurement of the amount of ionizing radiation absorbed by an object, equal to an energy of 100 ergs per gram of irradiated material (equal to 0.01 gray).
