Longman Dictionary of Contemporary English homepage

Topic: WATER

Date: 1200-1300
Origin: Probably from Middle Dutch boye, boeie, from Latin boia 'chain'; because a buoy is kept in place with a chain

buoy

1 noun
     
buoy1 [countable]
TTW an object that floats on the sea, a lake etc to mark a safe or dangerous area
Definition of buoy from the Longman Dictionary of Contemporary English within
the topic WATER
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