Roman Room is a term used to describe a type of architecture that was popular in Ancient Rome. It consists of a large, open space surrounded by a colonnade or portico. The two crossword solutions for this term are ATRIA (5 letters) and ATRIUM (6 letters). An ATRIUM is a large, open area that is usually the central part of a building, while an ATRIUM is a large, open space surrounded by a colonnade or portico.