ὑδρανός
From LSJ
To χάρις ὑμῖν οὕτω τίθησιν κτλ. → Thus he writes joy to you all, etc. (Cramer's Catena on 1 Thessalonians 1.1)
English (LSJ)
purifier, ὁ ἁγνιστὴς τῶν Ἐλευσινίων, Hsch.
Greek (Liddell-Scott)
ὑδρανός: ὁ, «ὁ ἁγνιστὴς τῶν Ἐλευσινίων» Ἡσύχ.· ὁ αὐτὸς μνημονεύει καὶ τὴν λέξ. ὑδράνη, ἡ, = τὸ ἀκραιφνὲς καὶ καθαρόν.