Weakly basic functional group derived from ammonia (NH) in which one or more hydrogen atoms are replaced by another atom. In aqueous solution it can accept a proton and carry a positive charge.

a molecule containing a nitrogen atom with two hydrogen atoms attached to the nitrogen

An organic compound containing the -NH2- group. Substances which contain this group are called amines. Examples include urea, and trimethylamine.

the radical -NH2

a structural characteristic of all amino acids