from The American Heritage® Dictionary of the English Language, 4th Edition
- n. An electrical instrument for detecting or monitoring sound under water.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. a transducer that converts underwater sound waves into electrical signals, rather like a microphone
from The Century Dictionary and Cyclopedia
- n. An instrument for detecting the flow of water in a pipe (thus locating waste) by the sounds produced in a microphone.
- n. An instrument used in auscultation whereby sounds are conveyed through a column of water.
Sorry, no etymologies found.
During some types of gynaecological examination, researchers have inserted a tiny microphone, called a hydrophone, into the uterus, enabling them to hear what the foetus can hear.
They used what's called a hydrophone to eventually get Humphrey out of that area.
A underwater "hydrophone" recorded the sound, and it was synched with the video.
The captain of our boat put a hydrophone in the water, and there were speakers on the deck.
Fish tagged with tiny transmitters emit a special signal when they pass by one of the hydrophone receivers.
Down below, Tomonori Akamatsu from Japan was listening for an audio trace with hydrophone omnidirectional equipment.
Late that afternoon the hydrophone operator aboard U-331, submerged off Alexandria, picked up the sound of turning screws.
I suspect the Russians have hydrophone networks on the sea floor near their coasts similar to our SOSUS and can detect/bomb an attack sub in those waters.
The hydrophone ‘listened’ for the sounds of volcanic activity.
Part of the evidence that the volcano is in a constant state of eruption comes from an underwater microphone – or hydrophone – that was deployed a year ago at NW Rota-1 by OSU geologist Bob Dziak.