Tholus

tholoi),[3] which means a circular building with a conical or vaulted roof.

[4] The Romans transliterated the word into the Latin tholus, which means cupola or dome.

[5] In 1973, the International Astronomical Union (IAU) adopted tholus as one of a number of official descriptor terms for topographic features on Mars and other planets and satellites.

[6][7] One justification for using neutral Latin or Greek descriptors was that it allowed features to be named and described before their geology or geomorphology could be determined.

Tholi are present on Venus, Mars, asteroid 4 Vesta, dwarf planet Ceres, and on Jupiter's moon Io.