D defs.my
Entry 2 senses Webster, 1913

Sheepskin

/shēp'-skĭnˌ/ · Sheep·skin · IPA /ʃˈiːpskˌɪn/
01 n. The skin of a sheep; or, leather prepared from it.
  1. 1.
    The skin of a sheep; or, leather prepared from it.
  2. 2.
    A diploma; -- so called because usually written or printed on parchment prepared from the skin of the sheep.[College Cant]