A heard sound or noise, especially an auditory hallucination or phantom sound that a person perceives without an external source.
From Greek 'akoasm,' derived from 'akoe' (hearing) and '-asma' (a suffix denoting a phenomenon). The term has been used in medical and psychological literature to describe auditory perceptions since ancient Greek medical texts.
An acoasm is different from a full auditory hallucination—it's like hearing ringing, buzzing, or random noises in your ears when nothing's actually there, and it can happen to anyone during extreme stress or as a symptom of certain neurological conditions!
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