noun
1. : sound III 1b
2. sound waves plural : longitudinal pressure waves in any material medium regardless of whether they constitute audible sound
earthquake waves and ultrasonic waves are sometimes called sound waves
noun
1. : sound III 1b
2. sound waves plural : longitudinal pressure waves in any material medium regardless of whether they constitute audible sound
earthquake waves and ultrasonic waves are sometimes called sound waves
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012