A peptide made up of eight amino acid residues.
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oc·ta·pep·tide .äk-tə-'pep-.tīd n a protein fragment or molecule (as oxytocin or vasopressin) that consists of eight amino acids linked in a polypeptide chain
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oc·ta·pep·tide (ok″tə-pepґtīd) a peptide which on hydrolysis yields eight amino acids.Medical dictionary. 2011.