substance P
noun
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
Medical definitions for substance p
substance P
n.
A short-chain polypeptide that functions as a neurotransmitter especially in the transmission of pain impulses from peripheral receptors to the central nervous system.