1. A measuring instrument that sends out an acoustic pulse in water and measures distances in terms of the time for the echo of the pulse to return
   "The fishing boat used an echo sounder to locate schools of fish";
   - sonar, asdic

Derived forms: echo sounders

Type of: measuring device, measuring instrument, measuring system, navigational instrument

Part of: pigboat [informal], sub [informal], submarine

Encyclopedia: Echo sounder