unimer

https://doi.org/10.1351/goldbook.08971
Species comprising only one monomer unit.
Note:
The term is commonly used to designate a dormant species in reversible-deactivation radical polymerization (RDRP) that contains only one monomer unit.
Source:
PAC, 2022, 94, 1093. (Terminology for chain polymerization (IUPAC Recommendations 2021)) on page 1125 [Terms] [Paper]