Definitions

from The Century Dictionary.

  • noun A round excavated tomb lined with masonry. See beehive tomb.
  • noun In classical arch., any circular building, as that designed by Polycletus at Epidaurus; also, a dome or cupola; a domed structure; specifically, at Athens, the round chamber, or rotunda, a public building connected with the prytaneum, in which the prytanes dined.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun astronomy, geology A small domical mountain or hill.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

From Latin tholus ("dome, rotunda").

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