imino acids
  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 acid, e.g. proline:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1343 (