Definition of nun buoy in English:

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nun buoy

Pronunciation: /ˈnən ˌbo͞oē/ /boi/

noun

US
A buoy that is circular in the middle and tapering to each end.
Example sentences
  • Nun buoys appear wherever commercial navigation occurs on the Mississippi, Illinois, Missouri, and Ohio Rivers.

Origin

Early 18th century: from obsolete nun 'child's top' and buoy.

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