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A chemical substance or medical device that affects synaptic transmission in nerve cells.
The American Heritage® Medical Dictionary Copyright © 2007, 2004 by Houghton Mifflin Company. Published by Houghton Mifflin Company. All rights reserved.
neuromodulatorA neuroregulator (e.g., endorphins, substance P) that can act locally on other neurons or at a distance, increasing or decreasing the effect of neurotransmitters, but which does not itself initiate depolarisation.
Segen's Medical Dictionary. © 2012 Farlex, Inc. All rights reserved.
neuromodulatorA substance that, while not affecting the rate of firing or conduction of nerve impulses, can change the effect on a nerve of other neurotransmitters. Neuromodulators can control neurotransmitter synthesis or the amounts of neurotransmitter released in response to other stimuli. Adenosine is an example of a neuromodulator.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005