The term nitroaniline in chemistry refers to a derivative of aniline

Aniline

Aniline, phenylamine or aminobenzene is an organic compound with the formula C6H5NH2. Consisting of a phenyl group attached to an amino group, aniline is the prototypical aromatic amine. Being a precursor to many industrial chemicals, its main use is in the manufacture of precursors to polyurethane...

 (C₆H₅NH₂) containing a nitro group (—NO₂) There are three simple nitroanilines of formula C₆H₄(NH₂)(NO₂) which differ only in the position of the nitro group:

• 2-Nitroaniline
  2-Nitroaniline
  2-Nitroaniline, also known as ortho-nitroaniline or o-nitroaniline, is an organic chemical compound that is chemically described as an aniline carrying a nitro functional group in position 2. It is classified as an aromatic amine. At ambient temperature and pressure, 2-nitroaniline is a powdered...
  
  
• 3-Nitroaniline
  3-Nitroaniline
  3-Nitroaniline, also known as 'meta'-nitroaniline and m-nitroaniline, is non-volatile stable solid commonly used as a raw material for dyes. 3-Nitroaniline is an aniline carrying a nitro functional group in position 3...
  
  
• 4-Nitroaniline
  4-Nitroaniline
  4-Nitroaniline, p-nitroaniline or 1-amino-4-nitrobenzene is an organic compound with the formula C6H6N2O2. It is an organic chemical compound, consisting of a phenyl group attached to an amino group which is para to a nitro group. The chemical structure of p-nitroaniline is shown at the right...
  
  

Some more complicated molecules with other substituent

Substituent

In organic chemistry and biochemistry, a substituent is an atom or group of atoms substituted in place of a hydrogen atom on the parent chain of a hydrocarbon...

s can also be referred to as nitroanilines, for example 4-chloro-3-nitro-aniline.