cornichon /kɔɹ.nɪ.ʃɔn/ noun2 •A dill-pickled gherkin cucumber.Garnished with excellent Dijon-style mustard, horseradish, cornichons, sprinkled with diced gelee, it was close to perfection as one is likely to get on a dinner plate. — 1988 •A French-style pickled miniature cucumber. formscornichons