brioche UK /ˈbriːɒʃ/US /bɹiːˈaʃ/ noun2 •A type of light sweet pastry or bun of French origin.French brioche dough is especially rich in butter and eggs. It's often retarded […] for 6–18 hours to stiffen it, then rolled out and briefly rested. — 2004 •A knitted cushion for the feet. formsbrioches