inhibitor

Also contains definition of: enzyme inhibitor
https://doi.org/10.1351/goldbook.I03035
A substance that diminishes the rate of a chemical reaction; the process is called @I03034@. Inhibitors are sometimes called negative catalysts, but since the action of an inhibitor is fundamentally different from that of a @C00876@, this terminology is discouraged. In contrast to a @C00876@, an inhibitor may be consumed during the course of a reaction. In enzyme-catalysed reactions an inhibitor frequently acts by binding to the enzyme, in which case it may be called an enzyme inhibitor.
See also:
effector
Source:
PAC, 1993, 65, 2291. (Nomenclature of kinetic methods of analysis (IUPAC Recommendations 1993)) on page 2295 [Terms] [Paper]
See also:
PAC, 1991, 63, 1227. (Manual on catalyst characterization (Recommendations 1991)) on page 1244 [Terms] [Paper]