Crossword Genius

Units of exposure to X-rays (3)

Ross

I believe the answer is:

roe

(Other definitions for roe that I've seen before include "Part of fish, sounds like go through water" , "eg Caviare" , "Hoofed animal(s)" , "Lobster's ripe ovary" , "Food from fish" .)

I've seen this clue in The Washington Post.
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