• WordNet 3.6
    • n hyperacusis abnormal acuteness of hearing due to increased irritability of the sensory neural mechanism; characterized by intolerance for ordinary sound levels
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Century Dictionary and Cyclopedia
    • n hyperacusis In pathol., excessive acuteness of the sense of hearing.
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In news:

Hyperacusis (hi-per-uh-cue-sis) is a rare disorder where an individual becomes highly sensitive to everyday sounds.
Some people think they have hyperacusis because they are bothered by noises such as lawnmowers, sirens, or loud music.