Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun Any of various skin diseases of humans and animals, characterized by epidermal shedding of flaky scales.

from The Century Dictionary.

  • noun In pathology, a condition of the skin or some portion of it in which it sheds more or less fine bran-like scales.
  • noun In ornithology, a genus of piping-crows of the family Corvidæ, founded by Lesson in 1837. The only species, P. gymnocephalus, inhabits Borneo and Sumatra.
  • noun A scaly eczema. Also called eczema squamosum and psoriasis diffusa.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Med.) A superficial affection of the skin, characterized by irregular patches of thin scales which are shed in branlike particles.
  • noun (Veter.) A disease of domestic animals characterized by dry epithelial scales, and due to digestive disturbances and alteration of the function of the sebaceous glands.
  • noun [NL.] (Med.), a parasitic disease of the skin, characterized by the development of reddish or brownish patches.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun pathology Any of several varieties of skin diseases characterized by the shedding of flakes or scales

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

  • noun any of several skin disorders characterized by shedding dry flakes of skin

Etymologies

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

[Greek pitūriāsis, from pitūron, grain husk, dandruff.]

Examples

  • In the summer, it's common for children and young adults to develop a benign skin condition called pityriasis alba.

    CNN.com

  • This patch is pityriasis, you see, it's coffee-coloured.

    Captain Corelli's Mandolin

  • Leprosy may in some instances resemble a chronic dermatosis such as eczema or pityriasis versicolor.

    Chapter 9

  • - Has no effect on candidiasis or pityriasis versicolor.

    Chapter 4

  • In aged people this condition is the pityriasis nigra of Willan.

    Anomalies and Curiosities of Medicine

  • Crocker it begins in the second or third week of life, and occasionally as late as the fifth week, with diffuse and universal scaling, which may be branny or in laminae like pityriasis rubra, and either dry or with suffusion beneath the epidermis.

    Anomalies and Curiosities of Medicine

  • According to Crocker it begins in the second or third week of life, and occasionally as late as the fifth week, with diffuse and universal scaling, which may be branny or in laminæ like pityriasis rubra, and either dry or with suffusion beneath the epidermis.

    Anomalies and Curiosities of Medicine

  • This is seen in its highest degree in itching diseases like prurigo and pityriasis.

    Anomalies and Curiosities of Medicine

  • In aged people this condition is the pityriasis nigra of Willan.

    Anomalies and Curiosities of Medicine

  • This is seen in its highest degree in itching diseases like prurigo and pityriasis.

    Anomalies and Curiosities of Medicine

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