ALPHA-ENDORPHIN By N., Pam M.S. - April 7, 2013 noun. a polypeptide carrying sixteen amino acids that have attitudinal importance which isn't full known or understood. ALPHA-ENDORPHIN: "Alpha -endorphins are one of the most common polypeptide structures known to exist." Related Psychology Terms PEPTIDE AMINO ACID IMBALANCE CATABOLISM TRYPTOPHAN AMINO ACID TRANSCRIPTION TRANSLATION POLYPEPTIDE EGO INVOLVEMENT PROTEIN METABOLISM Cite this page: N., Pam M.S., "ALPHA-ENDORPHIN," in PsychologyDictionary.org, April 7, 2013, https://psychologydictionary.org/alpha-endorphin/ (accessed July 15, 2020).