nitrogen

1. The chemical element (symbol N) with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas. (uncountable) · Holonyms: dinitrogen, N₂, nitrogen (loose sense)· By molar fraction, nitric oxide contains equal parts nitrogen and oxygen.
2. Molecular nitrogen (diatomic nitrogen), N₂, a colorless, odorless gas at room temperature, which constitutes most of air (78% of it). (uncountable) · Meronyms: nitrogen (strict sense), N· The air you breathe is mostly nitrogen.
3. A specific nitrogen atom within a chemical formula, or a specific isotope of nitrogen. (countable) · The two nitrogens are located next to one another on the ring.

Plural nitrogens