Meaning of SUBSTANCE P in English

SUBSTANCE P

noun Date: 1934 a neuropeptide that consists of 11 amino acid residues, that is present in the nervous system and gastrointestinal tract, that causes the contraction of smooth muscle and dilation of blood vessels, and that acts as a potent neurotransmitter especially in the transmission of signals from pain receptors

Merriam Webster. Explanatory English dictionary Merriam Webster.      Толковый словарь английского языка Мерриам-Уэбстер.