n. | 1. sound of a frequency above the upper limit of the normal range of human hearing, which is about 20 kilohertz 2. a technique that uses high-frequency sound waves for medical diagnosis and treatment, e.g. to create images of internal organs, to treat deep tissue disorders, and to break up kidney stones 3. an examination of an internal body part, especially a fetus in the womb, using ultrasound technology 4. a way of producing an image of an organ inside someone’s body using sound waves 1. sound of a frequency above the upper limit of the normal range of human hearing, which is about 20 kilohertz 2. a technique that uses high-frequency sound waves for medical diagnosis and treatment, e.g. to create images of internal organs, to treat deep tissue disorders, and to break up kidney stones 3. an examination of an internal body part, especially a fetus in the womb, using ultrasound technology 4. a way of producing an image of an organ inside someone’s body using sound waves |