Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The science of the interaction of acoustic and optical phenomena.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The science that studies the diffraction of light by ultrasonic sound.

Etymologies

acoust(ic) + optics.
(American Heritage® Dictionary of the English Language, Fourth Edition)
acousto- +‎ optics (Wiktionary)

Examples

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