Strong's #4686: matsuwd (pronounced maw-tsood')
 or (feminine) mtsuwdah {mets-oo-daw'}; or mtsudah {mets-oo-daw'}; for 4685; a net, or (abstractly) capture; also a fastness; --castle, defense, fort(-ress), (strong) hold, be hunted, net, snare, strong place.
Brown-Driver-Briggs Hebrew Lexicon:
 / ּ / ּ 
  mâtsûd / metsûdâh 
 
 1) net, prey, net prey
 
 1a) net
 1b) prey
 
 2) fastness, stronghold
 
  Part of Speech: noun feminine
Relation: for H4685
  Same Word by TWOT Number:  1885g, 1885i
Usage:
This word is used 22 times:
1 Samuel 22:4: "the while that David was  in the hold."
1 Samuel 22:5: "David, Abide not  in the hold; depart, and get thee into the land of Judah."
1 Samuel 24:22: "but David and his men got them up unto  the hold."
2 Samuel 5:7: "Nevertheless David took  the stronghold of Zion: the same is the city of David."
2 Samuel 5:9: "So David dwelt  in the fort, and called it the city of David. And David built"
2 Samuel 5:17: "heard of it, and went down to  the hold."
2 Samuel 22:2: "And he said, The LORD is my rock,  and my fortress, and my deliverer;"
2 Samuel 23:14: "And David was then  in a hold, and the garrison of the Philistines was then in Bethlehem."
1 Chronicles 11:5: "Nevertheless David took  the castle of Zion, which is the city of David."
1 Chronicles 11:16: "And David was then  in the hold, and the Philistines' garrison was then at Bethlehem."
Job 39:28: "upon the crag of the rock,  and the strong place."
Psalms 18:2: "The LORD is my rock,  and my fortress, and my deliverer; my God, my strength, in whom I will trust; my buckler,"
Psalms 31:2: "thou my strong rock, for a house  of defense to save"
Psalms 31:3: "For thou art my rock  and my fortress; therefore for thy name's sake lead me, and guide"
Psalms 66:11: "Thou broughtest  us into the net; thou laidst affliction upon our loins."
Psalms 71:3: "me; for thou art my rock  and my fortress."
Psalms 91:2: "I will say of the LORD, He is my refuge  and my fortress: my God; in him will I trust."
Psalms 144:2: "My goodness,  and my fortress; my high tower, and my deliverer; my shield, and he in whom I trust; who subdueth my people"
Ecclesiastes 9:12: "as the fishes that are taken in an evil  net, and as the birds that are caught in the snare;"
Ezekiel 12:13: "also will I spread upon him, and he shall be taken  in my snare: and I will bring him to Babylon to the land of the Chaldeans;"
Ezekiel 13:21: "and they shall be no more in your hand  to be hunted; and ye shall know that I"
Ezekiel 17:20: "my net upon him, and he shall be taken  in my snare, and I will bring him to Babylon, and will plead with"