VOOZH

URL: https://www.wordreference.com/definition/Oort cloud

⇱ Oort cloud - WordReference.com Dictionary of English

- See Also:
- - oomiak
  - oompah
  - oomph
  - oomycete
  - oomycota
  - Oona
  - oophorectomy
  - oophoritis
  - oophyte
  - oops
  - Oort cloud
  - oory
  - oosphere
  - oospore
  - Oost
  - Oostende
  - OOT
  - ootheca
  - ootid
  - ooze
  - ooze leather
- Recent searches:
- View All

Oort cloud

US:USA pronunciation: respellingUSA pronunciation: respelling(ôrt, ōrt)

in Spanish | in French | in Italian | English synonyms | English Usage | Conjugator | in context | images

WordReference Random House Unabridged Dictionary of American English © 2026

Oort′ cloud′ (ôrt, ōrt),USA pronunciation [Astron.]

Astronomya region of the solar system far beyond the orbit of Pluto in which billions of comets move in nearly circular orbits unless one is pulled into a highly eccentric elliptical orbit by a passing star.

after Dutch astronomer Jan Hendrik Oort (1900–1992), who proposed its existence 1975–80

Forum discussions with the word(s) "Oort cloud" in the title:

No titles with the word(s) "Oort cloud".

Visit the English Only Forum.
Help WordReference: Ask in the forums yourself.

Look up "Oort cloud" at Merriam-Webster
Look up "Oort cloud" at dictionary.com

Go to Preferences page and choose from different actions for taps or mouse clicks.

In other languages: Spanish | French | Italian | Portuguese | Romanian | German | Dutch | Swedish | Russian | Polish | Czech | Greek | Turkish | Chinese | Japanese | Korean | Arabic

Links: ⚙️Preferences | Abbreviations | Pron. Symbols | Privacy Policy | Terms of Service | Support WR | Forums | Suggestions

Advertisements

Advertisements

Report an inappropriate ad.

WordReference.com

WORD OF THE DAY

GET THE DAILY EMAIL!

Become a WordReference Supporter to view the site ad-free.

Firefox users: use search shortcuts for the fastest search of WordReference.

Copyright © 2026 WordReference.com

Please report any problems.