ortho acids

https://doi.org/10.1351/goldbook.O04331
Hypothetical compounds having the structure RC(OH)3. Thus hydrated forms of carboxylic acids. Orthocarbonic acid, C(OH)4, is generically included.
See also: ortho amides, ortho esters
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1354 (https://doi.org/10.1351/pac199567081307)