noun ·Rare ·Advanced level

Definitions

Noun

1. 1
   A small domical mountain or hill.

   "Hecates Tholus is a Martian volcano."

2. 2
   A round building, dome, or cupola.
3. 3
   Part of the apical structure of the asci of some lichen species.

Synonyms

All synonyms

thole

Example

More examples

"Hecates Tholus is a Martian volcano."

Etymology

From Latin tholus (“dome, rotunda”). Doublet of tholos.

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.