Definitions from Wiktionary (RAD)

▸ noun:  (metrology) A non-SI unit of absorbed dose of radiation, equal to 0.01 gray.
▸ noun:  A political radical.
▸ adjective:  (slang, dated) Clipping of radical; excellent. [Favoring fundamental change, or change at the root cause of a matter.]
▸ noun:  Abbreviation of radian. [(geometry) In the International System of Units, the derived unit of plane angle: the angle subtended at the centre of a circle by an arc of its circumference equal in length to the radius of the circle. Symbol: rad.]
▸ noun:  (automotive, plumbing, slang) Abbreviation of radiator. [Anything which radiates or emits rays.]
▸ noun:  (firearms, slang) Abbreviation of sight radius. [(firearms) The distance between the front and rear sights of a firearm.]
▸ noun:  (business, countable) Initialism of role activity diagram. [(business) A diagram illustrating the roles of people, teams, etc. in an organization and how they interact with each other and in response to external events.]
▸ noun:  (computing, uncountable) Initialism of rapid application development.
▸ noun:  (medicine) Initialism of reactive attachment disorder. [(medicine, psychology, pediatrics) A rare but serious condition in which an infant or young child fails to establish healthy attachments with parents or caregivers.]
▸ noun:  (NASA, space science) Initialism of Radiation Assessment Detector (a scientific instrument of the Mars Science Laboratory onboard the Curiosity rover at Mars.)

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