nitrogen
//ˈnaɪ.trə.dʒən//
Noun
1
A colorless, odorless gaseous chemical element (symbol N, atomic number 7) that constitutes about 78% of Earth's atmosphere and is essential for all living organisms.
Nitrogen makes up about 78% of the air we breathe.
2
Liquid nitrogen, used as a coolant or in cryogenic applications.
The laboratory stores samples in nitrogen to keep them frozen.