[flan] n [F, fr. OF flaon, fr. LL fladon-, flado flat cake, of Gmc origin; akin to OHG flado flat cake] (1846) 1 a: an open pie containing any of various sweet or savory fillings b: custard baked with a caramel glaze
2: the metal disk of a coin, token, or medal as distinguished from the design and lettering stamped on it