pendant group (side group)

https://doi.org/10.1351/goldbook.P04472
An offshoot, neither oligomeric nor polymeric from a chain.
Source:
PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2297 (https://doi.org/10.1351/pac199668122287)