The Collaborative International Dictionary of English v.0.48:

Pellicle \Pel"li*cle\, n. [L. pellicula, dim. of pellis skin:
   cf. F. pellicule.]
   1. A thin skin or film.
      [1913 Webster]

   2. (Chem.) A thin film formed on the surface of an
      evaporating solution.
      [1913 Webster]

WordNet (r) 3.0 (2006):

pellicle
    n 1: thin protective membrane in some protozoa

Moby Thesaurus II by Grady Ward, 1.0:

70 Moby Thesaurus words for "pellicle":
   allantoic membrane, amnion, amniotic sac, arachnoid membrane,
   basement membrane, coat, coating, collop, conjuctiva, covering,
   cut, deal, disk, eardrum, enamel, facing, feuille, film, flap,
   foil, fold, fur, hymen, lacquer, lamella, lamina, laminated glass,
   laminated wood, lap, leaf, maidenhead, membrana serosa,
   membrana tympana, membrane, meninges, meninx, neurilemma, paint,
   pane, panel, patina, peel, pericardium, perineurium, plait, plank,
   plate, plating, pleura, ply, plywood, rasher, revetment,
   safety glass, scale, scum, serosa, sheet, skin, slab, slat, slice,
   table, tablet, tympanic membrane, tympanum, varnish, velum, veneer,
   wafer