raths·kel·ler (rät'skěl'ər, rāt'-, rāth'-) n. A restaurant or tavern, usually below street level, that serves beer.
[German Ratskeller, Rathskeller, restaurant in the city hall basement : German Rat, council, counsel (from Middle High German rāt, from Old High German; see ar- in Indo-European roots) + German Keller, cellar (from Middle High German, from Old High German kellāri, from Latin cellārium; see cellar).]