One of the mysteries of the English language finally explained.
1A fold, a ridge; specifically = "plica". In early use also: †a plexus (obsolete rare). Also figurative. Now chiefly Botany.
Late Middle English (in an earlier sense). From Middle French plicature a place in the body where there is a bend and its etymon classical Latin plicātūra action of folding, a fold (Pliny), in post-classical Latin also a place in the body where there is a bend from plicāt-, past participial stem of plicāre to fold + -ūra.
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