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pres·by·a·cu·sis, presbyacusia (prez'bē-ă-kū'sis, -kū'sē-ă),
Loss of hearing associated with aging; manifest as reduced ability to perceive or discriminate sounds; the pattern and age of onset vary. See: phonemic regression.
[presby- + G. akousis, hearing]
progressive, bilateral loss of hearing with advancing age; occurs in several animal species, especially old dogs.