Crossword Genius

What "ecto-" means as a prefix (5)

Ross

I believe the answer is:

outer

(Other definitions for outer that I've seen before include "This space is beyond earth's atmosphere" , "External; part of archery target" , "Ring furthest from the bullseye" , "Surrounding" , "Ring for double scores on a dartboard" .)

I've seen this clue in The New York Times.
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