ROUND'HOUSE, noun 1. A constable's prison; the prison to secure persons taken up by the night-watch, till they can be examined by a magistrate. 2. In a ship of war, a certain necessary near the head, for the use of particular officers. 3. In large merchantmen and ships of war, a cabin or apartment in the after part of the quarter-deck, having the poop for its roof; sometimes called the coach. It is the master's lodging room.
Source: Webster's 1828 American Dictionary ↗ · public-domain · returned verbatim, no AI