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otosclerosis

(Science: otolaryngology) A pathological condition of the bony labyrinth of the ear, in which there is formation of spongy bone (otospongiosis), especially in front of and posterior to the footplate of the stapes, it may cause bony ankylosis of the stapes, resulting in conductive hearing loss. Cochlear otosclerosis may also develop, resulting in sensorineural hearing loss.

Origin: Gr. Sklerosis = hardening