castle, fort, (strong) hold, munition

Boyd’s Bible Dictionary:

“Castle” From Concise Bible Dictionary:

See FORTRESS.

Strong’s Dictionary of Hebrew Words:

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