| Sheepskin 1. (n.) The skin of a sheep; or, leather prepared from it. 2. (n.) A diploma; -- so called because usually written or printed on parchment prepared from the skin of the sheep. Thesaurus Entries 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 |