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hearing. the sense by which sounds are perceived, by conversion of sound waves into nerves impulses, which are then interpreted by the brain. Also, the capacity to perceive sound. The organ of hearing is the ear, which is divided into three sections, the outer, middle and inner ear. Each plays a special role in hearing.
(sound) 1. a pressure wave propagating through an elastic medium; waves with a frequency of 20â20,000 Hz cause the sensation of hearing. 2. the effect produced on the organ of hearing by vibrations of the air or other medium. 3. a noise, normal or abnormal, heard within the body. 4. an instrument to be introduced into a cavity to detect a foreign body or to dilate a stricture.