acouasm

[uh-koo-az-uh m, ak-oo-az-] /əˈku æz əm, ˈæk uˌæz-/
noun, Psychiatry.
1.
a nonverbal auditory hallucination, as a ringing or hissing.
Also, acoasm, acousma.
Origin
< Greek ákou(sma) something heard (akous-, stem of akoúein to hear + -ma resultative noun suffix) + -asm as in enthusiasm, orgasm, etc.