nitro-

from the GNU version of the Collaborative International Dictionary of English.

• prefix A combining form or an adjective denoting the presence of niter.
• prefix (Chem.) A combining form (used also adjectively) designating certain compounds of nitrogen or of its acids; also, designating the group or radical NO2, or its compounds, as nitrobenzene (C6H5.NO2).
• prefix the radical NO2; -- called also nitroxyl.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• prefix nitrate, nitrogen
• prefix containing the nitro functional group