a small peptide released upon stimulation in the nervous system and involved in regulation of the pain threshold.
Origin of substance P
earlier standard preparation P (1931); the initial is unexplained by the substance's discoverers
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Medicine definitions for substance p
A short-chain polypeptide that functions as a neurotransmitter especially in the transmission of pain impulses from peripheral receptors to the central nervous system.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.