multi-strand chain

Also contains definition of: n-strand chain

in polymers
A chain that comprises constitutional units connected in such a way that adjacent constitutional units are joined to each other through more than four atoms, more than two on at least one side of each constitutional unit.
Note:
A chain that comprises constitutional units joined to each other through n atoms on at least one side of each constitutional unit is termed an n-strand chain, e.g. three-strand chain. If an uncertainty exists in defining n, the highest possible number is selected.
Source:
PAC, 1996, 68, 2287 (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2295