Crossword Genius

Any phenomenally large number (7)

Ross

I believe the answer is:

zillion

(Other definitions for zillion that I've seen before include "Many millions" , "Indefinite large number, lots of noughts" , "Extremely large but unspecified number" , "Indefinite multiple of 22 Across" , "Unspecified enormous number" .)

I've seen this clue in The Guardian.
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