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Also acous‑, acou-, and acoustico-.

Sound or hearing.

Greek akoustikos, from akouein, to hear (acou‑ comes from the latter).

Acoustics is the branch of physics concerned with the properties of sound; the field of acoustooptics studies interactions between very high frequency sound waves and beams of laser light. In medicine, acousma (also called acouasm) is a non-verbal auditory hallucination, such as a ringing or hissing; acousticophobia is fear of noise. See also ‑acusis and audio‑.

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