atrio

n. vestibule, entrance hall, foyer, lobby, concourse, atrium

n. parvis, forecourt; atrium, chamber of the heart (Anatomy)

n. atrium, porch, vestibule

= atrium [atria, -pl.], portico.
Ex: The extension was designed to blend with the original listed building and the two have been linked by a glass atrium giving access to the whole library.
Ex: Most of these Medieval porticoes were walled up for security reasons.