Something that restrains, blocks, or suppresses. Inhibitor or inhibition may refer to: Corrosion inhibitor, a substance that decreases the rate of metal oxidation Enzyme inhibitor, a substance that binds to an enzyme and decreases the enzyme's activity Inhibition of return, a feature of attention. Inhibition Theory, a theory pertaining to the performance of a mental task Inhibitors (Revelation Space), machines in Alastair Reynolds's Revelation Space novels Lateral inhibition, a mechanism by wh… (More on Inhibition)