Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A short-chain polypeptide that functions as a neurotransmitter especially in the transmission of pain impulses from peripheral receptors to the central nervous system.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun biochemistry A tachykinin neuropeptide associated with inflammatory processes and pain.

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From p(ain).]

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