hydroxamic acids

https://doi.org/10.1351/goldbook.H02911
Compounds, $\ce{RC(=O)NHOH}$, derived from oxoacids $\ce{R_{k}E(=O)_{l}(OH)_{m}}$ ($l \neq 0$) by replacing $\ce{–OH}$ by $\ce{–NHOH}$, and hydrocarbyl derivatives thereof. Specific examples are preferably named as N-hydroxy amides.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1342 [Terms] [Paper]