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The Clue
Four-fifths of the atmosphere (8 letter answer)
The Answer
NITROGEN
Tags
Notes
The answer NITROGEN is so rare that it appears less than once every 2500 puzzles.
Related Clues
It's in the air
Most of the atmosphere
Definition
NITROGEN as a noun:
1. (nitrogen, N, atomic number 7) = a common nonmetallic element that is normally a colorless odorless tasteless inert diatomic gas; constitutes 78 percent of the atmosphere by volume; a constituent of all living tissues