Strong's G49 · Greek

ἁγνισμός

hagnismos · hag-nis-mos'

from 48; a cleansing (the act), i.e. (ceremonially) lustration

Scholarly Lexicons

Abbott-Smith Manual Greek Lexicon

 1 † ἁγνισμός , -οῦ, ὁ (> ἁγνίζω ), [in LXX: Nu 6:5 ( נֵזֶר ) 8:7 19:17 ( חַטּאת ), etc.;] purification : in ceremonial sense, Ac 21:26 (LXX) .† 

G. Abbott-Smith, A Manual Greek Lexicon of the New Testament (1922) — public domain