|1.||a. partially or totally unable to hear|
|b. See also tone-deaf (as collective noun; preceded by the): the deaf|
|2.||refusing to heed: deaf to the cries of the hungry|
|[Old English dēaf; related to Old Norse daufr]|
deafness deaf·ness (děf'nĭs)
The lack or loss of the ability to hear.
|deafness (děf'nĭs) Pronunciation Key
The lack or severe impairment of the ability to hear. Deafness is usually genetic or congenital as a result of prenatal viral infection, birth trauma, or other causes. Acquired deafness is caused mostly by drug toxicity, trauma, and certain diseases. Cochlear implants are used to treat some forms of deafness.