Pronunciation: (u-kOO"stō-op'tiks), [key]
—n. (used with a sing. v.)
the science and technology of the interactions between sound waves and light waves passing through material media, esp. as applied to the modulation and deflection of laser beams by ultrasonic waves.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.