Crossword Genius

Unit of radioactivity (5)

Ross

I believe the answer is:

curie

<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">unit of radioactivity</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>

(Other definitions for curie that I've seen before include "Unit of radioactivity" , "measure of radioactivity" , "Marie ---, found radium" , "Marie --, discoverer of Radium" , "Marie --, French chemist" .)

I've seen this clue in The Telegraph, The Times, The New York Times, the Canadiana and the Wall Street Journal.
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