English
icosapeptide
From icosa- + peptide.
Proto-Indo-European *dwi- ‘two’
Proto-Indo-European *déḱm̥ ‘ten’
Proto-Indo-European *(h₁)wídḱm̥ti
Proto-Hellenic *ewī́kəti
Ancient Greek εἴκοσι ‘twenty’
English icosa-
Proto-Indo-European *pékʷ-ye-
…
Ancient Greek πέπτω ‘soften, ripen, boil, cook, bake, digest’
Ancient Greek πεπτόν ‘cooked, digested’
German Pepton
German Peptid
English peptide
Today it means
noun Any oligopeptide that has twenty amino acid units
Language periods are conventional ranges, not dates for this word.
Etymograph / icosapeptide