The Collaborative International Dictionary of English v.0.48:

Cuticle \Cu"ti*cle\ (k[=u]"t[i^]*k'l), n. [L. cuticula, dim. of
   cutis skin; akin to E. hide skin of an animal.]
   1. (Anat.) The scarfskin or epidermis. See Skin.
      [1913 Webster]

   2. (Bot.) The outermost skin or pellicle of a plant, found
      especially in leaves and young stems.
      [1913 Webster]

   3. A thin skin formed on the surface of a liquid.
      [1913 Webster]

WordNet (r) 3.0 (2006):

cuticle
    n 1: the dead skin at the base of a fingernail or toenail
    2: the outer layer of the skin covering the exterior body
       surface of vertebrates [syn: epidermis, cuticle]
    3: hard outer covering or case of certain organisms such as
       arthropods and turtles [syn: carapace, shell, cuticle,
       shield]

Moby Thesaurus II by Grady Ward, 1.0:

27 Moby Thesaurus words for "cuticle":
   Leatherette, Leatheroid, coat, dermis, fell, fleece, flesh, fur,
   furring, hide, imitation fur, imitation leather, integument,
   jacket, leather, leather paper, outer layer, outer skin, pelt,
   peltry, rawhide, rind, sheath, skin, skins, tegument, vair