sonobuoy

[ son-uh-boo-e, -boi ]
/ ˈsɒn əˌbu ɛ, -ˌbɔɪ /

noun Navigation.

a buoy that emits a radio signal on receiving an underwater signal from a vessel.

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Origin of sonobuoy

First recorded in 1940–45; sono- + buoy
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for sonobuoy

sonobuoy
/ (ˈsəʊnəˌbɔɪ) /

noun

a buoy equipped to detect underwater noises and transmit them by radio

Word Origin for sonobuoy

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