The Collaborative International Dictionary of English v.0.48:

Plicate \Pli"cate\, Plicated \Pli"ca*ted\, a. [L. plicatus, p.
   p. of plicare to fold.]
   Plaited; folded like a fan; as, a plicate leaf. --
   Pli"cate*ly, adv.
   [1913 Webster]

WordNet (r) 3.0 (2006):

plicate
    v 1: fold into pleats, "Pleat the cloth" [syn: pleat,
         plicate]

Moby Thesaurus II by Grady Ward, 1.0:

46 Moby Thesaurus words for "plicate":
   crease, creased, crimp, crimped, crisp, dog-ear, dog-eared, double,
   double over, doubled, enfold, flexible, flounce, flounced, flute,
   fluted, fold, fold over, foldable, folded, folding, frill, gather,
   gathered, infold, interfold, lap over, plait, plaited, plat, pleat,
   pleated, pliable, plicated, plicatile, ply, quill, quilled, ruff,
   ruffle, ruffled, tuck, tucked, turn over, twill, twilled