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The Collaborative International Dictionary

Nitrogen \Ni`tro*gen\ (n[imac]"tr[-o]*j[e^]n), n. [L. nitrum natron + -gen: cf. F. nitrog[`e]ne. See Niter.] (Chem.) A colorless nonmetallic element of atomic number 7, tasteless and odorless, comprising four fifths of the atmosphere by volume in the form of molecular nitrogen ( N2). It is chemically very inert in the free state, and as such is incapable of supporting life (hence the name azote still used by French chemists); but it forms many important compounds, such as ammonia, nitric acid, the cyanides, etc, and is a constituent of all organized living tissues, animal or vegetable. Symbol N. Atomic weight 14.007. It was formerly regarded as a permanent noncondensible gas, but was liquefied in 1877 by Cailletet of Paris, and Pictet of Geneva, and boils at -195.8 [deg] C at atmospheric pressure. Liquid nitrogen is used as a refrigerant to store delicate materials, such as bacteria, cells, and other biological materials.


Chromophore \Chro"mo*phore\, n. [Gr. ? color + fe`rein to bear.] (Chem.) Any chemical group or residue (as NO2; N2; or O2) which imparts some decided color to the compound of which it is an ingredient.


N2, N-2 may be:

  • N₂, the chemical formula for nitrogen gas
  • N2 is the United States Navy term for a senior military intelligence officer
  • N2 diagram, a function to function data interchange
  • N 2 Gether Now, a 1999 song by nu metal band Limp Bizkit
  • DSC-N2, a 2006 Sony Cyber-shot series digital camera
  • N2, a postcode district in the N postcode area
  • NicoNico, N2 company logo for niconico live video
  • The fourth level in the Japanese Language Proficiency Test
N2 (Bangladesh)

The N2 is a Bangladeshi national highway connecting the Bangladeshi capital Dhaka and the town of Tamabil in the Sylhet District. The route passes through the city of Sylhet, crossing the Surma River on the Keane bridge, and sections of the highway are known as the Dhaka–Sylhet Highway and the Sylhet-Tamabil Highway. It is part of AH1 and AH2 in the Asian Highway Network.

This road has been called the deadliest road in the world.