Crossword Genius

Unit of radiation (3)

Ross

I believe the answer is:

rem

'unit of radiation' is the definition.
(I've seen this in another clue)

This is all the clue.

(Other definitions for rem that I've seen before include "Phase in sleep" , "Sleep stage when dreaming occurs" , "radiation unit" .)

I've seen this clue in the Penny Press.
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