ἁγνιστής
From LSJ
ἀλλ' εἰ μὲν ἁγνόν ἐστί σοι Πειθοῦς σέβας, γλώσσης ἐμῆς μείλιγμα καὶ θελκτήριον → but if you have holy reverence for Persuasion, the sweetness and charm of my tongue
English (LSJ)
οῦ, ὁ, A purifier, Gloss.
Greek (Liddell-Scott)
ἁγνιστής: -οῦ, ὁ, ὁ καθαρίζων, ὡς τὸ ἁγνίτης, Γλωσσ.
Spanish (DGE)
-οῦ, ὁ purificador, Gloss.2.216.