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substance P

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noun
  1. a small peptide released upon stimulation in the nervous system and involved in regulation of the pain threshold.
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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. 2018

substance p in Medicine

substance P

n.
  1. A short-chain polypeptide that functions as a neurotransmitter especially in the transmission of pain impulses from peripheral receptors to the central nervous system.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.