castle, fort, (strong) hold, munition

Boyd’s Bible Dictionary:

(fort). The “Tower of Antonia,” N. W. corner of the Temple at Jerusalem (Acts 21:34,37; 22:24; 23:10,16,32).

“Castle” From Concise Bible Dictionary:

See FORTRESS.

“Munition” From Concise Bible Dictionary:

Fortress, stronghold (Isa. 29:7; Isa. 33:16; Nah. 2:1).

Strong’s Dictionary of Hebrew Words:

Number:
4679 (find all occurrences in KJV Bible)
Transliteration:
mtsad
Phonic:
mets-ad’
Meaning:
or mtsad {mets-awd'}; or (feminine) mtsadah {mets-aw-daw'}; from 6679; a fastness (as a covert of ambush)
KJV Usage:
castle, fort, (strong) hold, munition