Watchtower

From BiblePortal Wikipedia

Holman Bible Dictionary [1]

 2 Kings 9:17 Isaiah 5:2 Mark 12:1Tower

King James Dictionary [2]

WATCHTOWER, n. watch and tower. A tower on which a sentinel is placed to watch for enemies or the approach of danger.

Webster's Dictionary [3]

(n.) A tower in which a sentinel is placed to watch for enemies, the approach of danger, or the like.

References