Franc/fræŋk/ Definition 1 of 2Pro Tip 1/3Countries Using Franc Franc is not only used in France; it’s also money for some other countries. In his wallet, he had euros, Swiss francs, and dollars. Pro Tip 2/3Historical Currency The franc used to be the official French currency before the euro. My grandmother told me how she used to spend francs in Paris. Pro Tip 3/3French Franc Obsolete The French franc is no longer in use, it was replaced by the euro in 2002. He found an old French franc coin, a relic of a bygone era.