undatio
undātio, ōnis, f. (undo), das Wellenschlagen, Überwallen, Th. Prisc. 3, 5.
hec tempore estatis et fructuum ~o pluviarum corrumpit magisterium
T. M. molendinario de S. pro molacione 10 quar. frumenti cause nimii [sic ] ~onis aque de were
per tempestates, fluctus, et ~ones maris et aquarum
undātĭō, ōnis, f. (undo), écume : Th. Prisc. 3, 5.