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bell buoy

American  

noun

Nautical.
  1. a buoy having a bell that is rung by the motion of the buoy.


bell buoy British  

noun

  1. a navigational buoy fitted with a bell, the clapper of which strikes when the waves move the buoy

"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

Etymology

Origin of bell buoy

First recorded in 1830–40