ἀπόπλυσις
From LSJ
Ἅγιος ὁ Θεός, Ἅγιος ἰσχυρός, Ἅγιος ἀθάνατος, ἐλέησον ἡμᾶς → holy God, holy Mighty, holy Immortal, have mercy on us
English (LSJ)
εως, ἡ,
A washing away, Alex. Aphr. in Sens.94.13.
Greek (Liddell-Scott)
ἀπόπλῠσις: -εως, ἡ, πλύσις, καθαρισμός, Ἀχμ. Ὀνειρ. 231: -πλῠτέον, ῥηματ. ἐπίθ., πρέπει τις ν’ ἀποπλύνῃ, νὰ καθαρίσῃ, Γεωπ. 16. 18, 2.