Roundhouse
Roundhouse , noun
1.
A constable's prison; a lockup, watch-house, or station house. [Obsolete]
2.
(a) (Nautical) A cabin or apartment on the after part of the quarter-deck, having the poop for its roof; -- sometimes called the coach.
(b)
(Nautical) A privy near the bow of the vessel.
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.