radio-sono buoy
1sono-radio buoy — |sä(ˌ)nō noun Etymology: son + radio + buoy : sonobuoy …
2sonobuoy — /son euh booh e, boy /, n. Navig. a buoy that emits a radio signal on receiving an underwater signal from a vessel. [1940 45; SONO + BUOY] * * * …
