\Round"house`\, n.
1. A constable's prison; a lockup, watch-house, or station
   house. [Obs.]
2. (Naut.)
   (a) A cabin or apartament 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.
3. A house for locomotive engines, built circularly around a
   turntable.