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sonobuoy

[son-uh-boo-e, -boi] /ˈsɒn əˌbu ɛ, -ˌbɔɪ/
noun, Navigation.
1.
a buoy that emits a radio signal on receiving an underwater signal from a vessel.
Origin of sonobuoy
1940-1945
First recorded in 1940-45; sono- + buoy
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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British Dictionary definitions for sonobuoy

sonobuoy

/ˈsəʊnəˌbɔɪ/
noun
1.
a buoy equipped to detect underwater noises and transmit them by radio
Word Origin
from sonic + 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
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