An obsolete term for
oximes, based on the fact that compounds with a nitroso group,
–N=O,
bonded to a
–CR2H
group readily tautomerize to
oximes.
Source:
PAC, 1995, 67, 1307
(Glossary of class names of organic compounds and reactivity intermediates based on
structure (IUPAC Recommendations 1995))
on page 1345