ringing noise in head
Synonym for acousma ... Rarely used term for an auditory hallucination in which indefinite sounds, such as ringing or hissing, are heard. ... Synonym: acouasm. ... Origin: G. Akousma, something heard ... (05 Mar 2000) ... 
acouasm In psychiatry: a nonverbal auditory hallucination, such as a ringing or hissing in the ears; acousma; also known as tinnitus.
a nonverbal auditory hallucination, as a ringing or hissing.