hyperacusis

Medical Dictionary

hyperacusis hy·per·a·cu·sis (hī'pər-ə-kōō'sĭs, -kyōō'-)
n.
Abnormally acute hearing due to heightened irritability of the sensory neural mechanism.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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WordNet
hyperacusis

noun
abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels 
WordNet® 3.0, © 2006 by Princeton University.
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