[son-uh-boo-e, -boi]
noun Navigation.
a buoy that emits a radio signal on receiving an underwater signal from a vessel.

1940–45; sono- + buoy Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
sonobuoy (ˈsəʊnəˌbɔɪ)
a buoy equipped to detect underwater noises and transmit them by radio
[from sonic + buoy]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
It utilizes a combination of proven sonobuoy sensors and adaptations of current technologies to meet the mission needs.
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