- rad⇄rad(1) orRad, noun, pl.radorrads,RadorRads.
a unit for measuring absorbed doses of radiation, equal to 100 ergs of energy per gram.
Ex. The quantity of total body radiation that is fatal in almost all cases is close to 800 rads (Arnold L. Bac - rad⇄rad(2), adjective.
(Slang.) terrific; fantastic; radical.