Crossword Genius

Operating system developed at Bell Labs (4)

Ross

I believe the answer is:

unix

'operating system developed at bell labs' is the definition.
(I've seen this in another clue)

This is the entire clue.

(Other definitions for unix that I've seen before include "See this operating system" , "Computer open operating system" , "software" .)

I've seen this clue in the USA Today, The New York Times, the L.A. Times Daily and The Chronicle of Higher Education.
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