macrocycle

https://doi.org/10.1351/goldbook.M03662
A cyclic @M03667@ or a @M03667@ cyclic portion of a macromolecule.
Note:
In the literature, the term 'macrocycle' is sometimes used for molecules of low molecular mass that would not be considered 'macromolecules' as specified in the definition given in this book.
See:
chain (Note 2) (in polymers)
Source:
PAC, 1996, 68, 2287. (Glossary of basic terms in polymer science (IUPAC Recommendations 1996)) on page 2298 [Terms] [Paper]