Inhibitor
Inhibitor or inhibition may refer to:

Biology
Enzyme inhibitor, a substance that binds to an enzyme and decreases the enzyme's activity
Reuptake inhibitor, a substance that increases neurotransmission by blocking the reuptake of a neurotransmitter
Lateral inhibition, a neural mechanism that increases contrast between active and (neighbouring) inactive neurons
Inhibitory postsynaptic potential, a synaptic potential that decreases the firing of a neuron

Chemistry
Corrosion inhibitor, a substance that decreases the rate of metal oxidation
Reaction inhibitor, a substance that prevents or decreases the rate of a chemical reaction
Polymerisation inhibitor, a substance that inhibits unwanted polymerisation of monomers

Psychology
Cognitive inhibition, the mind's ability to tune out irrelevant stimuli
Inhibitory control,  a cognitive process that permits an individual to inhibit their impulses
Inhibition of return, a feature of attention
Latent inhibition, a term used in classical conditioning
Memory inhibition, processes that suppress or interfere with specific memories
Sexual inhibition, reservations relating to sexual practices
Social inhibition, a conditioned fear reaction to social marginalization or isolation

Media
Inhibitors, machines in the Revelation Space novels by Alastair Reynolds
Inhibitions (song), a 2008 single by Swedish band Alcazar
Inhibition (album), the debut album by alternative rock band Dot Hacker

Other uses
Inhibition (law)

See also
Preservative, a substance that inhibits spoilage
Embalming, the preservation of human remains
Food preservation, the inhibition of microbial growth in food
Nuclear poison, an inhibitor of nuclear reactions
League of Legends, structure which spawns super minions