Strong's #49: hagnismos (pronounced hag-nis-mos')
from 48; a cleansing (the act), i.e. (ceremonially) lustration:--purification.
Thayer's Greek Lexicon:
̔́
hagnismos
1) purification, expiation
Part of Speech: noun masculine
Relation: from G48
Citing in TDNT: 1:124, 19
Usage:
This word is used 1 times:
Acts 21:26: "accomplishment of the days of purification, until that an offering should be offered"