plica polonica
/ˌplɪkə pəˈlɒnɪkə/ /ˌplʌɪkə pəˈlɒnɪkə/Medicine. Now chiefly historical
noun
A matted condition of the hair, generally associated with poor hygiene and pediculosis.
Origin
Mid 17th century; earliest use found in Alexander Ross (1591–1654), Church of England clergyman and writer on philosophy. From post-classical Latin Plica Polonica from plica + Polonica, feminine singular of Polonicus Polish.