Added 10 October 2026 semioval adjective Categories: Obscure Words adjective ! Definition from Wiktionary (CC BY-SA). More about semioval at Wordnik → Where our words come from → Half oval. noun A two-dimensional figure that has one straight edge and a rounded edge, similar to a semicircle but elongated in height or width. Origin From semi- + oval. From Wiktionary, via Kaikki.org (CC BY-SA) Related Words: semiovatesemiconicalsemiconicsubovalsemicircularsemi-circularovaloidovalsemidomicalsemi-ellipticalsemilunarysemicircled Back to today's word