One of those articles where I knew very little about what it was talking about so I ended up learning a slew of words.
(in classical architecture) a main beam resting across the tops of columns, specifically the lower third entablature
A vestibule at the front of a classical temple, enclosed by a portico and projecting sidewalls
An antechamber, hall, or lobby next to the outer door of a building
A small room leading to a main one
A rounded convex molding, in cross section a quarter of a circle or ellipse
An ornamental device adorning the fundamental quarter-round, convex ovolo profile of moulding, consisting of alternating details on the face of the ovolo (aka egg-and-tongue, egg and anchor, or egg and star)