monomeric unit (monomer unit, mer)

https://doi.org/10.1351/goldbook.M04018
The largest constitutional unit contributed by a single monomer molecule to the structure of a macromolecule or oligomer molecule.
Note:
The largest @C01288@ contributed by a single @M04019@ to the structure of a macromolecule or @O04286@ may be described as either monomeric, or by @M04017@ used adjectivally.
Source:
PAC, 1996, 68, 2287. 'Glossary of basic terms in polymer science (IUPAC Recommendations 1996)' on page 2290 (https://doi.org/10.1351/pac199668122287)