λούτριον
From LSJ
Ἀναξαγόρας δύο ἔλεγε διδασκαλίας εἶναι θανάτου, τόν τε πρὸ τοῦ γενέσθαι χρόνον καὶ τὸν ὕπνον → Anaxagoras used to say that we have two teachers for death: the time before we were born and sleep | Anaxagoras said that there are two rehearsals for death: the time before being born and sleep
English (LSJ)
τό,
A water that has been used in washing, Ar.Eq. 1401, Fr.306, Luc.Lex.4. II = λουτήρ, λ. χαλκοῦν μέγα CPR p.125 (iii A. D.).
Greek (Liddell-Scott)
λούτριον: τό, ὕδωρ χρησιμεῦσαν εἰς λοῦσιν, ἀπόλουμα, ἀπόλουτρον, Ἀριστοφ. Ἱππ. 1401, Ἀποσπ. 290, Λουκ. Λεξιφ. 4.