plication

from WordNet (r) 3.0 (2006)

plication
    n 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"
         [syn: {fold}, {crease}, {plication}, {flexure}, {crimp},
         {bend}]
    2: the act of folding in parallel folds [syn: {plication},
       {pleating}]

from The Collaborative International Dictionary of English v.0.48

Plication \Pli*ca"tion\, n.
   A folding or fold; a plait. --Richardson.
   [1913 Webster]