any of various short-chain peptides, as endorphins, that function as neuromodulators in the nervous system and as hormones in the endocrine system.
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British Dictionary definitions for neuropeptide
a peptide produced by neural tissue, esp one with hormonal activity
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012