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watchtower

noun [C]
 
 
/ˈwɒtʃˌtaʊər/ US  /ˈwɑːtʃˌtaʊr/

Definition

a tower built especially around the edges of prisons and army camps, the top of which provides a good position from which to see anyone who is coming closePlaces involved in military activityProtection and protectorsEnvironmental issues
(Definition of watchtower noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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