Definition of pityriasis in English:

pityriasis

Syllabification: pit·y·ri·a·sis
Pronunciation: /ˌpitəˈrīəsis
 
/

noun

[with modifier] Medicine
  • A skin disease characterized by the shedding of fine flaky scales.
    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.

Origin

late 17th century: modern Latin, from Greek pituriasis 'scurf', from pituron 'bran', + -asis.

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