Rad
Etimology of Rad
(You may find rad at the world legal encyclopedia and the etimology of more terms).
x-ray dose unit, 1918, shortened form of radiation (q.v.). As shortened form of radical; this term is also a noun., it is attested in political slang from 1820. Teen slang sense of “extraordinary, wonderful” is from late 1970s (see radical (adj.)).
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