Extended Strong's Greek Lexicon (Abbott-Smith based)
to purify
Usage: ἁγνίζω (> ἁγνός), [in LXX always ceremonially, chiefly for קָדַשׁ ;] to purify, cleanse from defilement; __(a) ceremonially: Jhn.11:55, Act.21:24, 26 24:18; __(b) morally: Jas.4:8, 1Pe.1:22, 1Jn.3:3. † SYN.: καθαρίζω, which see (and see: ἁγνός). (AS)