mo·nop·ter·os 
(mə-nŏptər-əs)
(mə-nŏptər-əs)n. pl. mo·nop·te·roi (-tə-roi′)
A classical structure consisting of a circle of pillars supporting a domed roof, often serving as a temple.
[Latin monopteros, consisting of a monopteros, having a single row of columns and no cella : Greek mono-, mono- + Greek pteron, wing, winglike thing (perhaps on the model of Greek peripteros, flying or going all around, having a single row of columns all around); see pet- in the Appendix of Indo-European roots.]