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sonar

Syllabification: so·nar
Pronunciation: /ˈsōˌnär
 
/

Definition of sonar in English:

noun

1A system for the detection of objects under water and for measuring the water’s depth by emitting sound pulses and detecting or measuring their return after being reflected.
Example sentences
  • Out in the Atlantic, vast Japanese factory ships work nonstop, using modern sonar detection to spot the tuna shoals they sweep the ocean clean of fish.
  • For instance, he said, its active and passive sonar systems are aging, thus shortening the range of its monitoring.
  • Now, video footage and sonar data proves conclusively that the wreck is not Centaur.
1.1An apparatus used in a sonar system.
Example sentences
  • It is equipped with a ham radio set, personal computer, global positioning system, two sonars, autopilot and wind wane which steers the boat depending on the direction of the wind.
  • It just seemed to me that it would be more interesting to have things like submarine sonars and old grandfather clocks and lines from famous movies and bird songs and things like that.
  • Acms receives data from the sonars and other sensors and, through advanced algorithms and data handling, displays real time images on the command consoles.
1.2The method of echolocation used in air or water by animals such as bats or whales.
Example sentences
  • Hearing the unusual ping, the animals might turn on their echolocators - their sonar - and then they can sense the net.
  • While the animals lack sonar, they do posses superb directional underwater hearing and the ability to see in near-darkness.
  • They believe that by being in the water with the animals and feeling their sonar they too are receiving a ‘healing’.

Origin

1940s: from so(und) na(vigation and) r(anging), on the pattern of radar.

More
  • sound from (Old English):

    There are four different ‘sounds’ in English. The one relating to noise is from Latin sonus. Related words are dissonance (Late Middle English) ‘inharmonious’; resonance (Late Middle English) ‘echo, resound’; resonant (late 16th century); resound (Late Middle English); and sonorous (early 17th century). Sonar, however, is an acronym formed from Sound Navigation and Ranging on the pattern of radar. Sound, meaning ‘in good condition, not damaged or diseased’, is from Old English gesund. In Middle English the prominent sense was ‘uninjured, unwounded’. Use of sound to mean ‘having well-grounded opinions’ dates from the early 16th century; the phrase as sound as a bell appeared in the late 16th century. This puns on the first meaning of sound, and also on the fact that a cracked bell will not ring true. The third sound (Late Middle English) ‘ascertain the depth of water’ is from Old French sonder, based on Latin sub- ‘below’ and unda ‘wave’. The final one for a narrow stretch of water is Middle English from Old Norse sund ‘swimming, strait’, related to swim.

Words that rhyme with sonar

dinarwebinarseminarFragonard

Definition of sonar in:

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