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watchtower

[woch-tou-er]
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noun
  1. a tower on which a sentinel keeps watch.
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Origin of watchtower

First recorded in 1535–45; watch + tower1
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for watchtower

watchtower

noun
  1. a tower on which a sentry keeps watch
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for watchtower

n.

1540s, from watch (v.) + tower (n.).

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Online Etymology Dictionary, © 2010 Douglas Harper