light·house

[lahyt-hous]
noun, plural light·hous·es [-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. 2013.
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Collins
World English Dictionary
lighthouse (ˈlaɪtˌhaʊs) [Click for IPA pronunciation guide]
 
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
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00:10
Lighthouse is always a great word to know.
So is gobo. Does it mean:
a chattering or flighty, light-headed person.
a screen or mat covered with a dark material for shielding a camera lens from excess light or glare.
Etymonline
Word Origin & History

lighthouse
1620s, from light (n.) + house.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
He was at first trained to be a lighthouse engineer, following the profession
  of his family.
It could have been the lighthouse but it's not conclusive.
Air traffic control towers may someday go the way of the lighthouse.
He even went so far as to suggest that the state should get out of the
  lighthouse business.
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