Crossword Genius

What our H was derived from (3)

Ross

I believe the answer is:

eta

(Other definitions for eta that I've seen before include "When one is due" , "Seventh Greek letter" , "When's end of journey predicted" , "giving expected termination of journey" , "Something like 10 [RHO]" .)

I've seen this clue in the Newsday.
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