Definition of imino acids

1. 1. An obsolete term, which should not be used, for imidic acids .

   2. Any carboxylic acid having an imino substituent, HN=, replacing two hydrogens. A shortened form of imino carboxylic acid.

   3. Obsolescent term for azaalkanoic acids and azacycloalkane-2-carboxylic acids. E.g. proline