ἀπόμαγμα
From LSJ
Ἓν οἶδα, ὅτι οὐδὲν οἶδα → I know only one thing, that I know nothing | all I know is that I know nothing.
English (LSJ)
ατος, τό,
A anything used for wiping or cleaning, Hp.Medic.2. 2 dirt washed off, S.Fr.34. II impression of a seal, Thphr.CP6.19.5, Lap.67.