monopteros
A classical temple made up of one circle of columns supporting a roof.
I leafed through the various boxes and drawers, staring sometimes for minutes on end at a star-shaped vault or diamond frieze, a hermitage, a monopteros or a mausoleum, without knowing what I was looking at or why.
Where it comes from
From Latin monopteros, from Ancient Greek μονόπτερος (monópteros), from μονο- (mono-, “mono-”) + πτερόν (pterón, “wing; circle of columns”).
Adapted from the Wiktionary entry monopteros (CC BY-SA 4.0).