Unit of radioactivity (5)

I believe the answer is:

curie

'unit of radioactivity' is the definition.
(I've seen this before)

This is the entire clue.

(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 Canadiana, The Times, The New York Times and the Wall Street Journal.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.