Strong's G3794 — ὀχύρωμα (noun)
ochuroma (okh-oo'-ro-mah) n.
1. a castle
2. (figuratively) argument
[from a remote derivative of G2192 (meaning to fortify, through the idea of holding safely)]
KJV: stronghold 
Root(s): G2192 
Hebrew root: ἔχω
Occurrences: 1