PITYRIASIS Meaning of PITYRIASIS in English [ ˌpɪtɪ'rʌɪəsɪs ]■ noun Medicine a skin disease characterized by the shedding of fine flaky scales.OriginC17: mod. L., from Gk pituriasis 'scurf'. Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004