retardation

in polymer science
https://doi.org/10.1351/goldbook.08967
Diminished rate of polymerization brought about by the action of a retarder.
Source:
PAC, 2022, 94, 1093. 'Terminology for chain polymerization (IUPAC Recommendations 2021)' on page 1124 (https://doi.org/10.1515/pac-2020-1211)