Univalent groups formed by removing a hydrogen atom from a hydrocarbon, e.g. ethyl, phenyl.
See: heterocyclyl, organoheteryl, organyl groups
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1341 (https://doi.org/10.1351/pac199567081307)