phosphono

https://doi.org/10.1351/goldbook.P04564
A prefix indicating the presence of the group –P(=O)(OH)2.
See:
phospho
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1358 [Terms] [Paper]