rotunda

noun3

1. •
   A round building, usually small, often with a dome.

   • The purely Greek character of the temple is revealed in the fact that there is no portico aligning the structure; Roman tholoi and rotundae are usually distinguished by a portico. — 1998
2. •
   A form of cupola that has pentagons rather than squares or rectangles.
3. •
   A Gothic typeface used in early printed books in Northern Italy, based on a rounded script developed in the 13th cent.; the manuscript hand on which this typeface was based.