Added 10 October 2026 nightshirt noun Categories: ThingsRare Words noun ! Definition from Wiktionary (CC BY-SA). More about nightshirt at Wordnik → Where our words come from → A shirt-like garment (often oversized) that is worn to bed. He wore a blue striped nightshirt and bedroom slippers. Origin From night + shirt. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: nightdressesnightgownsnightdressnightgownnightclothessleepshirtsleepwearnightwearnightrobebedclothesnight-gownpajamas Back to today's word