amidines

https://doi.org/10.1351/goldbook.A00267
Derivatives of oxoacids RnE(=O)OH in which the hydroxy group is replaced by an amino group and the oxo group is replaced by =NR . Amidines include carboxamidines, sulfinamidines and phosphinamidines, R2P(=NR)NR2 . In organic chemistry an unspecified amidine is commonly a carboxamidine.
See also: carboxamidines, sulfinamidines
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1315 (https://doi.org/10.1351/pac199567081307)