Hypertext Webster Gateway: "watchtower"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Watchtower \Watch"tow`er\, n.
A tower in which a sentinel is placed to watch for enemies,
the approach of danger, or the like.
From WordNet (r) 1.7 (wn)
watchtower
n : an observation tower for a lookout to watch over prisoners
or watch for fires or enemies
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