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Meaning of neuromodulator

neu•ro•mod•u•la•tor

Pronunciation: (noor"ō-moj'u-lā"tur), [key]
— n. Biochem.
  1. any of various substances, as certain hormones and amino acids, that influence the function of neurons but do not act as neurotransmitters.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.