Strong’s Greek
G3794 — ochuroma
The entry below is Strong’s own definition (1890, public domain), and every verse where the word occurs.
ὀχύρωμα
ochuroma — pronounced okh-oo'-ro-mah
from a remote derivative of 2192 (meaning to fortify, through the idea of holding safely); a castle (figuratively, argument):--stronghold. see GREEK for 2192
1 occurrence in the KJV.
2 Corinthians 10:4
(For the weapons of our warfare are not carnal, but mighty through God to the pulling down of strong holds;)