Crossword Genius

Abundant gas (8)

Ross

I believe the answer is:

nitrogen

(Other definitions for nitrogen that I've seen before include "Chief component of air" , "It constitutes 78 percent of the atmosphere" , "Gas forming about four-fifths of atmosphere" , "Constituent of four fifths of earth's atmosphere" , "Inert nog is an inert gas" .)

I've seen this clue in The Times.
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