branched chain

in polymers
https://doi.org/10.1351/goldbook.B00721
A chain with at least one branch point intermediate between the boundary units.
Source:
PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2293 (https://doi.org/10.1351/pac199668122287)