- a conical, unlighted buoy used as a channel marker, especially on the starboard side of a channel entering from seaward.
Compare can buoy.
Origin of nun buoy
1695–1705; obsolete nun spinning top + buoy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for nun buoy
The boat shaved a nun-buoy outside Barmouth Point so closely that Staff could almost have touched it by stretching out his arm.The Bandbox
Louis Joseph Vance
- nautical a buoy, conical at the top, marking the right side of a channel leading into a harbour: green in British waters but red in US watersCompare can buoy
C18: from obsolete nun a child's spinning top + buoy