roundhouse

n. 1. A constable's prison; a lockup, watch-house, or station house. [ Obs. ] [ 1913 Webster ]

2. (Naut.) (a) A cabin or apartment on the after part of the quarter-deck, having the poop for its roof; -- sometimes called the coach. (b) A privy near the bow of the vessel. [ 1913 Webster ]

3. A house for servicing and repair of locomotive engines, built circularly around a turntable bearing railroad tracks, with several tracks leading in and out. [ 1913 Webster + PJC ]