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.

Origin of sonobuoy

First recorded in 1940–45; sono- + buoy

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