adjective
- extremely rare; exceptionally uncommon
Examples
- The museum acquired an ultrarare manuscript from the 12th century.
- This ultrarare butterfly species has only been spotted three times in the wild.
- Collectors pay enormous sums for ultrarare baseball cards from the 1950s.
- The ultrarare mineral was discovered in only one location on Earth.
- Scientists were thrilled to observe the ultrarare astronomical event.
- The ultrarare vintage wine sold for a record price at auction.