Medical Dictionary

mediator

noun me·di·a·tor \ˈmēd-ē-ˌāt-ər\

Medical Definition of MEDIATOR

:  one that mediates; especially :  a mediating agent (as an enzyme or hormone) in a chemical or biological process <substance P, a neuropeptide mediator of analgesic stimuli in peripheral sensory nerves—D. R. Robinson>

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