rad
"x-ray dose unit," 1918, shortened form of radiation, q.v.. As shortened form of radical, n., it is attested in political slang from 1820. Teen slang sense of "extraordinary, wonderful" is from late 1970s (see radical, adj.).
| 词汇 | rad |
| 词根词缀 | Online Etymology Dictionary rad "x-ray dose unit," 1918, shortened form of radiation, q.v.. As shortened form of radical, n., 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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