a cylindrical, unlighted buoy used as a channel marker.
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Compare nun buoy.
Origin of can buoy
First recorded in 1620–30
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Examples from the Web for can buoy
He had so little room that his main-boom hit the can-buoy as he swept by.The Seiners|James B. (James Brendan) Connolly
British Dictionary definitions for can buoy
nautical a buoy with a flat-topped cylindrical shape above water, marking the left side of a channel leading into a harbour: red in British waters but green (occasionally black) in US watersCompare nun 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