D defs.my
Entry 1 sense Webster, 1913

Acoustics

/(#; 277)/ · A·cous·tics · IPA /əˈkuː.stɪks/
01 n. The science of sounds, teaching their nature, phenomena, and laws.
  1. 1.
    The science of sounds, teaching their nature, phenomena, and laws.(Physics.)
    Acoustics, then, or the science of sound, is a very considerable branch of physics.” — Sir J. Herschel.