endorphin

WORDNET DICTIONARY

endorphin(n = noun.substance) Array - a neurochemical occurring naturally in the brain and having analgesic properties; Array

has particulars: beta endorphin, enkephalin

endorphin, n. Biochem. any of a group of peptide neurotransmitters occurring naturally in the brain and having pain-relieving properties.

Etymology

F endorphine f. endog{egrave}ne endogenous + MORPHINE