lighthouse

[lahyt-hous]
noun, plural lighthouses [lahyt-hou-ziz] .
1.
a tower or other structure displaying or flashing a very bright light for the guidance of ships in avoiding dangerous areas, in following certain routes, etc.
2.
either of two cylindrical metal towers placed forward on the forecastle of the main deck of a sailing ship, to house the port and starboard running lights.

Origin:
1655–65; light1 + house

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
lighthouse (ˈlaɪtˌhaʊs)
 
n
a fixed structure in the form of a tower equipped with a light visible to mariners for warning them of obstructions, for marking harbour entrances, etc

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

lighthouse
1620s, from light (n.) + house.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He even went so far as to suggest that the state should get out of the
  lighthouse business.
Wildlife enthusiasts paid the lighthouse keeper to protect the two birds from
  hunters.
He also improved lighthouse signaling and created a quick-release system for
  railway carriages.
Air traffic control towers may someday go the way of the lighthouse.
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