/euh kooh"az euhm, ak"ooh az'-/ , n. Psychiatry.
a nonverbal auditory hallucination, as a ringing or hissing.
Also, acoasm, acousma .
[ ákou ( sma ) something heard ( akous-, s. of akoúein to hear + -ma resultative n. suffix) + -asm as in ENTHUSIASM, ORGASM, etc. ]