acous-, acou-, acouo-, acoustico-, acouto-, acousti-, -acousia, -acousis, -acoustical, acu-, -acusis-, -acusia +

1. Impaired hearing.
2. Auditory illusions or hallucinations.

Multiplying or magnifying sound.

The art of magnifying sounds.

1. Dullness of hearing characteristic of old age.
2. Loss of the ability to perceive or to discriminate sounds which is associated with aging; the pattern and age of onset vary.
3. A progressive, bilaterally symmetric perceptive hearing loss occurring with age.
4. The most common type of hearing loss in the elderly, consisting of slowly progressive, bilaterally symmetrical, sensorineural hearing loss. It often involves poor speech discrimination.

1. A disorder of hearing in which the subject hears his own voice altered in timber and tonality.
2. The erroneous localization of a laterally situated source of sound; mistaken or false hearing.

Hearing sounds that don’t exist; false hearing.

A subjective (imaginary) sensation as if sounds were altered in pitch and quality.

An expert or specialist in psycho-acoustics.

1. The science that deals with the perception of sound and the production of speech.
2. The scientific study of the psychological and physiological principles of sound perception.
3. A discipline combining experimental psychology and physics that deals with the physical features of sound as related to audition, as well as with the physiology and psychology of sound recepter processes.
4. The scientific investigation of the way in which animals, including man, hear, particularly the reception and analysis of the input signal. It is the study of the relationship between the physical characteristics of sound and its biologic processing.

Hearing loss induced by exposure to loud noise encountered in everyday life, apart from occupational noise.

Overly amplified music is an example of such a noise or overly loud sound in movie theaters is another one.

A reference to the senses or faculties of both equilibration (equilibrium or being evenly balanced) and hearing.

Heard with the stethoscope.

Involving the perception of a sound beyond or apart from the possibility of ordinary hearing.

Acoustical engineering deals with practical applications of sound and with the control of sound and vibration. It is concerned not just with audible sound, but also with sound and vibration phenomena that range from barely measurable magnitudes to levels capable of inducing severe damage.