Dictionary.net

k[=o]-f[=o]'sis, n. total deafness. [Gr.,--k[=o]phos, deaf.]

Diminution or loss of hearing. Cullen uses the word synonymously with Dysecoaea, and Pinel with Paracousia or Paracae. According to Sauvages, Cophosis differs from both, - from Dysecoea,because in it the sonorous rays cannot reach the labyrinth; and from Paracousia, which consists in a confused state of hearing.