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Meaning of hyperkeratosis

hy•per•ker•a•to•sis

Pronunciation: (hī"pur-ker"u-tō'sis), [key]
— n.
    1. proliferation of the cells of the cornea.
    2. a thickening of the horny layer of the skin.
  1. Also calleda disease of cattle resulting from their physical contact with or eating of objects or food contaminated by wood preservatives or machinery lubricants containing highly chlorinated naphthalenes, characterized by thickening and hardening of the skin, abnormal secretion of tears and saliva, and diarrhea.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.