sheepskin noun3 •The skin of a sheep, especially an adult sheep, and especially when used to make parchment or in bookbinding. •The tanned skin of a sheep with the fleece left on, especially when used for clothing, rugs, etc. •(US) A diploma, especially the one representing a university or college degree.[…] he took his sheepskin with a bow and a gesture that extinguished several of his companions — 1919 formssheepskins