The vinyl group (
CH2=CH–) and derivatives formed by substitution. Informally, a group, such as
–OH, attached to the free valence of a (substituted) vinyl group is sometimes referred to as 'vinylic'.
Source:
PAC, 1995, 67, 1307. 'Glossary of class names of organic compounds and reactivity intermediates based on structure (IUPAC Recommendations 1995)' on page 1374 (https://doi.org/10.1351/pac199567081307)