Added 9 October 2026 sheepskin noun Categories: NatureLanguageRare Words In Latin: mastrūca Wiktionary noun ! Definition from WordNet 3.1, Princeton University. More about sheepskin at Wordnik → Where our words come from → Tanned skin of a sheep with the fleece left on; used for clothing. Skin of a sheep or goat prepared for writing on. A document certifying the successful completion of a course of study. Origin From sheep + skin. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: lambskinparchmentfleecediplomabookfellvellumforrillpacksheetkeratolmembrana Back to today's word