Based on the Random House Dictionary, © Random House, Inc. 2012.
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| (used as a nonsense word by children to express approval or to represent the longest word in English.) |
| a white, crystalline, water-insoluble solid, C14H9Cl5, usually derived from chloral by reaction with chlorobenzene in the presence of fuming sulfuric acid: used as an insecticide and as a scabicide and pediculicide: agricultural use prohibited in the U.S. |
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hyperkeratosis hy·per·ker·a·to·sis (hī'pər-kěr'ə-tō'sĭs)
n. pl. hy·per·ker·a·to·ses (-sēz)
Hypertrophy of the cornea or the horny layer of the skin. Also called hyperkeratinization.
hy'per·ker'a·tot'ic (-tŏt'ĭk) adj.
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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hyperkeratosis
in cattle, a disease characterized by inflammation and thickening of the horny covering of the epidermis, the outermost layer of the skin. Other symptoms include weight loss, wartlike swellings in the mouth, drooling, and a runny nose. Severely afflicted animals usually die. Although once attributed to a virus, the disease is now known to be caused by the ingestion of feed contaminated with chlorinated naphthalene, a lubricant used to grease feed mills. The term hyperkeratosis is also used to describe the hypertrophy of the corneous layer of the human skin.
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