sonar ( sonars plural ) Sonar is equipment on a ship which can calculate the depth of the sea or the position of an underwater object using sound waves. n-var
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"Collins Cobuild English Dictionary for Advanced Learners 4th edition published in 2003 © HarperCollins Publishers 1987, 1995, 2001, 2003 and Collins A-Z Thesaurus 1st edition first published in 1995 © HarperCollins Publishers 1995"