Definition of "rad" in English

adjective

1. (slang, dated) Clipping of radical (“excellent”).

noun

1. (metrology) A non-SI unit of absorbed dose of radiation, equal to 0.01 gray, that is, 1 centigray.

   • Near-synonyms: centigray, cGy (same physical quantity)

2. Symbol for the radian, a unit of measure for angle.

3. (automotive, plumbing, slang) Clipping of radiator.

4. (firearms, slang) Abbreviation of sight radius.

5. Clipping of radical: a political radical.