Peignoir definition is - a woman's loose negligee or dressing gown. Recent Examples on the Web. Familiar snippets of classical music float through scenes like one of Lola’s peignoirs, and lines of poetry (written by Mr. Leteiler) dangle in the air. — Jeannette Catsoulis, New York Times, "Review: In ‘Shining Moon,’ Two Gay Chilean Actors Confront the Past," 8 Mar. 2018 Another, dressed ...