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.