sheepskin

from WordNet (r) 3.0 (2006)
sheepskin
    n 1: tanned skin of a sheep with the fleece left on; used for
         clothing [syn: {sheepskin}, {fleece}]
    2: skin of a sheep or goat prepared for writing on [syn:
       {parchment}, {sheepskin}, {lambskin}]
    3: a document certifying the successful completion of a course
       of study [syn: {diploma}, {sheepskin}]
    
from The Collaborative International Dictionary of English v.0.48
Sheepskin \Sheep"skin`\, n.
   1. The skin of a sheep; or, leather prepared from it.
      [1913 Webster]

   2. A diploma; -- so called because usually written or printed
      on parchment prepared from the skin of the sheep. [College
      Cant]
      [1913 Webster]
    
from Moby Thesaurus II by Grady Ward, 1.0
24 Moby Thesaurus words for "sheepskin":
      affidavit, attestation, authority, authorization, bill of health,
      certificate, certificate of proficiency, certification, credential,
      deposition, diploma, navicert, notarized statement, note,
      sworn statement, testamur, testimonial, ticket, visa, vise,
      voucher, warrant, warranty, witness

    

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