Dictionary entry

ἁγνισμός

G. Abbott-Smith's A Manual Greek Lexicon of the New Testament

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ἁγνισμός, -οῦ, ὁ (> ἁγνίζω),

[in LXX: Nu 6:5 (נֵזֶר) 8:719:17 (חַטּאת), etc.;]

purification: in ceremonial sense, Ac 21:26(LXX).†