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The Collaborative International Dictionary
NO2

Nitric \Ni"tric\, a. [Cf. F. nitrique. See Niter.] (Chem.) Of, pertaining to, or containing, nitrogen; specifically, designating any one of those compounds in which, as contrasted with nitrous compounds, the element has a higher valence; as, nitric oxide; nitric acid.

Nitric acid, a colorless or yellowish liquid obtained by distilling a nitrate with sulphuric acid. It is powerfully corrosive, being a strong acid, and in decomposition a strong oxidizer.

Nitric anhydride, a white crystalline oxide of nitrogen ( N2O5), called nitric pentoxide, and regarded as the anhydride of nitric acid.

Nitric oxide, a colorless poisous gas ( NO) obtained by treating nitric acid with copper. On contact with the air or with oxygen, it becomes reddish brown from the formation of nitrogen dioxide ( NO2, also called nitric dioxide or nitric peroxide).

NO2

nitro- \ni"tro-\pref.

  1. A combining form or an adjective denoting the presence of niter.

  2. (Chem.) A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids; as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene ( C6H5.NO2).

    Nitro group, the radical NO2; -- called also nitroxyl.

NO2

nitro- \ni"tro-\pref.

  1. A combining form or an adjective denoting the presence of niter.

  2. (Chem.) A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids; as nitrohydrochloric, nitrocalcite; also, designating the group or radical NO2, or its compounds, as nitrobenzene ( C6H5.NO2).

    Nitro group, the radical NO2; -- called also nitroxyl.

NO2

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.

Wikipedia
NO2

NO is nitrogen dioxide.

NO2 or NO may also refer to:

  • Nitrite ion, NO
  • Nitronium ion, NO
  • –NO, nitro functional group, characteristic of nitro compounds
  • "NO", a song by American rock band Phish, from their album Phish