Strong’s Greek
G1245 — diakatharizo
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
διακαθαρίζω διακαθαίρω
diakatharizo — pronounced dee-ak-ath-ar-id'-zo
from 1223 and 2511; to cleanse perfectly, i.e. (specially) winnow:--thoroughly purge. see GREEK for 1223 see GREEK for 2511
2 occurrences in the KJV.
Matthew 3:12
Whose fan is in his hand, and he will throughly purge his floor, and gather his wheat into the garner; but he will burn up the chaff with unquenchable fire.
Luke 3:17
Whose fan is in his hand, and he will throughly purge his floor, and will gather the wheat into his garner; but the chaff he will burn with fire unquenchable.