plica polonica en · NOUN
Etymology
From Latin plica (“plica”) + feminine singular form of Polonicus (“Polish”).
Meanings
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(historical, uncountable) A condition characterised by matted and unhygienic hair.
And perhaps the very essence of the Plica Polonica may be the hairs growing hollow, and of an unnatural constitution.
1665, Robert Hooke, Micrographica, section XXXII: