rotunda

[ roh-tuhn-duh ]
/ roʊˈtʌn də /

noun

a round building, especially one with a dome.
a large and high circular hall or room in a building, especially one surmounted by a dome.

Origin of rotunda

1680–90; alteration of Italian rotonda, noun use of feminine of rotondo < Latin rotundus rotund
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British Dictionary definitions for rotunda

rotunda

/ (rəʊˈtʌndə) /

noun

a building or room having a circular plan, esp one that has a dome

Word Origin for rotunda

C17: from Italian rotonda, from Latin rotundus round, from rota a wheel
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012