from the GNU version of the Collaborative International Dictionary of English
- n. A double ear trumpet for estimating the direction from which sounds proceed, esp. for the use of navigators.
from The Century Dictionary and Cyclopedia
- n. An instrument, invented by A. M. Mayer, for ascertaining the direction from which any sound proceeds, as the sound of a bell, whistle, or fog-horn at sea in thick weather.
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