from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A noncontagious inflammatory skin disease characterized by recurring reddish patches covered with silvery scales.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A noncontagious disease whose main symptom is gray or silvery flaky patches on the skin which are red and inflamed underneath when scratched.

from the GNU version of the Collaborative International Dictionary of English

  • n. The state of being affected with psora.
  • n. A cutaneous disease, characterized by imbricated silvery scales, affecting only the superficial layers of the skin.

from The Century Dictionary and Cyclopedia

  • n. A chronic non-contagious skin-disease, characterized by reddish, slightly elevated, dry patches of varying size, shape, and number, covered with whitish or grayish imbricated scales.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. a chronic skin disease characterized by dry red patches covered with scales; occurs especially on the scalp and ears and genitalia and the skin over bony prominences


Greek psōriāsis, itch, mange, from psōriān, to have the itch, from psōrā, itch.
(American Heritage® Dictionary of the English Language, Fourth Edition)
From Ancient Greek ψωρίασις, from ψώρα ("itch") (English psora) + -σις (-sis, "nouns of action") (English -sis). (Wiktionary)



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