noun
: determination of the distance and direction of an object (as under water) by means of an echo (as of sound) returned by the object — compare echo sounding , sonar
noun
: determination of the distance and direction of an object (as under water) by means of an echo (as of sound) returned by the object — compare echo sounding , sonar
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012