Added 9 October 2026 pillowcase /ˈpɪləʊˌkeɪs/ noun Categories: ThingsRare Words noun ! Definition from Wiktionary (CC BY-SA). Pronunciation from Wiktionary, via Kaikki.org. More about pillowcase at Wordnik → Where our words come from → A washable, easily removable cloth cover for pillows. Origin From pillow + case. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: slipcasepillow-casehindclothshamcoverlidseatcoverthrowsheet Back to today's word