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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 Indo-European roots.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
n, pl -teroi (-təˌrɔɪ) or -tera (-tərə)
(Architecture) a circular classical building, esp a temple, that has a single ring of columns surrounding it
[C18: Late Latin from Greek, from mono- + pteron a wing]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014