so·no·buoy (s n  -b   , -boi)n. A buoy equipped with an acoustic receiver and a radio transmitter that emits radio signals when it detects underwater sounds. |
sonobuoy [ˈsəʊnəˌbɔɪ]
n
(Mathematics & Measurements / Navigation) a buoy equipped to detect underwater noises and transmit them by radio
[from sonic + buoy]
A sonar device used to detect submerged submarines that, when activated, relays information by radio. It may be active directional or nondirectional, or it may be passive directional or nondirectional.
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