polypeptide

noun

Etymology: Etymology tree Proto-Indo-European *pleh₁- Proto-Indo-European *polh₁ús Ancient Greek πολῠ́ς (polŭ́s)lbor. English poly- Proto-Indo-European *pekʷ- Proto-Indo-European *pékʷ-ye- Proto-Hellenic *péťťō Ancient Greek πέσσω (péssō)bf. Ancient Greek πέπτω (péptō) Ancient Greek πεπτόν (peptón)der. German Peptonbor. English peptone Proto-Indo-European *dʰeh₁-der. Proto-Italic *-iðos Latin -idusder. English -ide ▲ German Pepton ▲ Latin -idusder. German -id German Peptidbor. English peptide English polypeptide From poly- + peptide.

1. Any polymer of (same or different) amino acids joined via peptide bonds.
2. Any such polymer that is not folded into a secondary structure of a protein.
3. A small protein containing up to 100 amino acids; see also oligopeptide.