https://doi.org/10.1351/goldbook.L03438
  1. Cyclic
    hemiacetals
    formed by
    intramolecular
    addition of a hydroxy group to an aldehydic or ketonic carbonyl group. They are thus 1-oxacy-cycloalkan-2-ols or unsaturated analogues, e.g.
  2. [obsolete] This term has also been used for hydroxy
    lactones
    , but such use is not recommended.
Source:
PAC, 1995, 67, 1307. (Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)) on page 1347 [Terms] [Paper]