nitrogen

1. (uncountable) The chemical element (symbol N) with an atomic number of 7 and atomic weight of 14.0067. It is a colorless and odorless gas.Examples: "All life depends on nitrogen; it is the building block from which nature assembles amino acids, proteins, and nucleic acids; the genetic information that orders and perpetuates life is written in nitrogen ink."uncountable

2. (uncountable) Molecular nitrogen (N₂), a colorless, odorless gas at room temperature.Examples: "Volatiles of kecap manis and its raw materials were extracted using Likens-Nickerson apparatus with diethyl ether as the extraction solvent. The extracts were then dried with anhydrous sodium sulfate, concentrated using a rotary evaporator followed by flushing using nitrogen until the volume was about 0.5 ml."uncountable

3. (countable) A specific nitrogen atom within a chemical formula, or a specific isotope of nitrogen.Examples: "The two nitrogens are located next to one another on the ring."countable