lightship

[lahyt-ship]
noun
a ship anchored in a specific location and displaying or flashing a very bright light for the guidance of ships, as in avoiding dangerous areas. Abbreviation: LS

Origin:
1830–40; light1 + ship

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Collins
World English Dictionary
lightship (ˈlaɪtˌʃɪp)
 
n
a ship equipped as a lighthouse and moored where a fixed structure would prove impracticable

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Encyclopedia Britannica
Encyclopedia

lightship

marine navigation and warning beacon stationed where lighthouse construction is impractical. The first lightship was the Nore (1732), stationed in the estuary of the River Thames in England. Modern lightships are small, unattended vessels equipped with fog signals, radio beacons, and gimbal devices for keeping the navigational light beam horizontal in rough weather. Their names are marked in large letters for easy daytime recognition

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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Example sentences
In some locations a lighted buoy or a lightship solved this problem.
Visitors constantly ask about being able to tour fishing vessels and the lightship.
In some locations, a lighted buoy or a lightship solved this pro b l e m.
Total weight of the craft is the sum of: lightship craft, fuel, and variable payload.
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