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lighthouse

[lahyt-hous]
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noun, plural light·hous·es [lahyt-hou-ziz] /ˈlaɪtˌhaʊ zɪz/.
  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 of lighthouse

First recorded in 1655–65; light1 + house
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

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British Dictionary definitions for lighthouse

lighthouse

noun
  1. 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 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 lighthouse

n.

1620s, from light (n.) + house (n.).

Online Etymology Dictionary, © 2010 Douglas Harper