pit·​y·​ri·​a·​sis ˌpi-ti-ˈrī-ə-səs How to pronounce pityriasis (audio)
: any of various skin conditions of humans or domestic animals marked by dry scaling patches of skin

Examples of pityriasis in a Sentence

Recent Examples on the Web What is pityriasis rosea? Lauren Caruso, Allure, 17 Aug. 2021 Shah says the large, scaly flakes from the videos could also be pityriasis amiantacea, which is a severe form of seborrheic dermatitis that is a result of psoriasis, eczema, or even a fungal infection. Jessica Cruel, Allure, 20 July 2018

These examples are programmatically compiled from various online sources to illustrate current usage of the word 'pityriasis.' Any opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback about these examples.

Word History


New Latin, from Greek, from pityron scurf

First Known Use

1684, in the meaning defined above

Time Traveler
The first known use of pityriasis was in 1684

Dictionary Entries Near pityriasis

Cite this Entry

“Pityriasis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/pityriasis. Accessed 24 Jun. 2024.

Medical Definition


pit·​y·​ri·​a·​sis ˌpit-ə-ˈrī-ə-səs How to pronounce pityriasis (audio)
plural pityriases -ˌsēz How to pronounce pityriasis (audio)
: any of several skin diseases marked by the formation and desquamation of fine scales
: a disease of domestic animals marked by dry epithelial scales or scurf due to alteration of the function of the sebaceous glands and possibly associated with digestive disorders
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