ultima thule

/AH1 L T IH0 M AH0 TH UW0 L/

noun

1
A place beyond the borders of the known world.
2
Highest achievement.
3
(astronomy, informal) Synonym of Arrokoth (“trans-Neptunian object (486958) 2014 MU69”).
4
Alternative letter-case form of ultima Thule (“a place beyond the known world; highest achievement”). [A place beyond the borders of the known world.]

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