1. ultima thule - Noun
2. Ultima thule - Proper noun
A place beyond the borders of the known world.
Highest achievement.
Ultima Thule (plural Ultimae Thules or Ultima Thules)
Alternative letter-case form of ultima Thule (“a place beyond the known world; highest achievement”)
Ultima Thule
(astronomy, informal) Synonym of Arrokoth (“trans-Neptunian object (486958) 2014 MU69”)
ultima thule (plural ultimae thules or ultima thules)
Alternative letter-case form of ultima Thule (“a place beyond the known world; highest achievement”)