argentationn.

/ɑːdʒənˈteɪʃən/Etymology: noun of action < Latin argentāt-: see argentate adj. and -ation suffix. Compare French argentation (Littré Supp.).
rare. Apparently only attested in dictionaries or glossaries.
1731 Bailey Dict. in S. Johnson Dict.
This entry has not yet been fully updated (first published 1885; most recently modified version published online June 2021).