Wiktionary(0.00 / 0 votes)Rate this definition: quiche(Noun) A pie made primarily of eggs and cream in a pastry crust. Other ingredients such as chopped meat or vegetables are often added to the eggs before the quiche is baked. Quiche. Quiche is a savory, open-faced pastry crust with a filling of savory custard with cheese, meat, fish or vegetables.