Nitrogen definition

nītrə-jən
A nonmetallic element that constitutes nearly four-fifths of the air by volume, occurring as a colorless, odorless, almost inert diatomic gas, N2 , in various minerals and in all proteins and used in a wide variety of applications, including manufacture of ammonia, nitric acid, TNT, and fertilizers, and as a cryogen. Atomic number 7; atomic weight 14.0067; melting point −210.00°C; boiling point −195.80°C; valence 2, 3, 4, 5.
noun
4
0
A nonmetallic element that makes up about 78 percent of the atmosphere by volume, occurring as a colorless, odorless gas. It is a component of all proteins, making it essential for life, and it is also found in various minerals. Nitrogen is used to make ammonia, nitric acid, TNT, and fertilizers. Atomic number 7; atomic weight 14.0067; melting point −209.86°C; boiling point −195.8°C; valence 3, 5.
1
0
A colorless, tasteless, odorless, gaseous chemical element forming nearly four fifths of the atmosphere: it is a component of all proteins and nucleic acids: symbol, N; at. no. 7
noun
1
1
(uncountable) A chemical element (symbol N) with an atomic number of 7 and atomic weight of 14.0067.
noun
0
0
(uncountable) Molecular nitrogen (N2), a colorless, odorless gas at room temperature.
noun
0
0
Advertisement
(countable) A specific nitrogen within a chemical formula, or a specific isotope of nitrogen.

The two nitrogens are located next to one another on the ring.

noun
0
0
(physics) A radioactive isotope of nitrogen, 137N, having seven protons and six neutrons, and a half-life of less than ten minutes; it is used in positron emission tomography.
noun
0
0
(physics) The major stable isotope of nitrogen, 147N, having seven protons and seven neutrons; it accounts for well over 99% of the natural element.
noun
0
0
(physics) A minor stable isotope of nitrogen, 157N, having seven protons and eight neutrons; it accounts for less than 0.4% of the natural element; it is used in nuclear magnetic resonance spectroscopy.
noun
0
0

Other Word Forms

Noun

Singular:
nitrogen
Plural:
nitrogens

Origin of nitrogen

  • French nitrogène nitro- nitric acid (from New Latin nitro–) -gène -gen

    From American Heritage Dictionary of the English Language, 5th Edition

  • From French nitrogène (coined by Lavoisier), corresponding to nitro- + -gen.

    From Wiktionary