ultrasonic adj of, concerned with, or producing waves with the same nature as sound waves but frequencies above audio frequencies See also →
n the use of ultrasound to vibrate a piece to be cleaned while the piece is immersed in a cleaning fluid. The process produces a very high degree of cleanliness, and is used for jewellery and ornately shaped items
n (Engineering) the scanning of material with an ultrasonic beam, during which reflections from faults in the material can be detected: a powerful nondestructive test method
n the use of high-energy vibration of ultrasonic frequency to produce a weld between two components which are held in close contact
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