Definition of pityriasis in English:

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Pronunciation: /ˌpɪtɪˈrʌɪəsɪs/


[mass noun, with modifier] Medicine
A skin disease characterized by the shedding of fine flaky scales: pityriasis rosea
More example sentences
  • Compared with pityriasis rosea, psoriatic lesions are thicker and scalier, and the lesions are not usually distributed along skin creases.
  • The rash of pityriasis rosea can look like eczema, ringworm, or psoriasis.
  • Some of these disease processes are known by well-established names, such as pityriasis nigra, sporotrichosis, and chromoblastomycosis.


Late 17th century: modern Latin, from Greek pituriasis 'scurf', from pituron 'bran'.

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