sonar

Từ điển WordNet v3.1 - WordNet Dictionary

noun

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 (Freq. 6)
- sonar is an acronym for sound navigation ranging
- asdic is an acronym for antisubmarine detection investigation committee
• Syn:
echo sounder, asdic
• Hypernyms:
measuring instrument, measuring system, measuring device, navigational instrument
• Part Holonyms:
submarine, pigboat, sub, U-boat
• Part Meronyms:
pinger, pulse generator

• Từ đồng nghĩa / Synonyms:
  echo sounder, asdic