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