plication in WordNet English dictionary

1. an angular or rounded shape made by folding
   "a fold in the napkin"; "a crease in his trousers"; "a plication on her blouse"; "a flexure of the colon"; "a bend of his elbow"
   fold  crease  plication  flexure  crimp  bend 
   
2. the act of folding in parallel folds
   plication  pleating