a small peptide released upon stimulation in the nervous system and involved in regulation of the pain threshold.
[ earlier standard preparation P (1931); the initial is unexplained by the substance's discoverers ]
a small peptide released upon stimulation in the nervous system and involved in regulation of the pain threshold.
[ earlier standard preparation P (1931); the initial is unexplained by the substance's discoverers ]
Random House Webster's Unabridged English dictionary. Полный английский словарь Вебстер - Random House . 2012