echo sounder is a noun meaning "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". It carries one recorded sense.
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
“sonar is an acronym for sound navigation ranging”
“asdic is an acronym for antisubmarine detection investigation committee”
Definitions, synonyms and semantic relations for echo sounder come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.