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We found 21 dictionaries with English definitions that include the word oort cloud: Click on the first link on a line below to go directly to a page where "oort cloud" is defined. General (15 matching dictionaries) Oort cloud: American Heritage Dictionary of the English Language [home, info] Oort cloud: Collins English Dictionary [home, info] Oort cloud: Vocabulary.com [home, info] Oort cloud: Merriam-Webster's Online Dictionary, 11th Edition [home, info] Oort cloud: Wiktionary [home, info] Oort cloud: Infoplease Dictionary [home, info] Oort cloud: Dictionary.com [home, info] Oort cloud: UltraLingua English Dictionary [home, info] Oort Cloud: Wikipedia, the Free Encyclopedia [home, info] Oort cloud: Rhymezone [home, info] Oort Cloud: Stammtisch Beau Fleuve Acronyms [home, info] oort cloud: Free Dictionary [home, info] oort cloud: Mnemonic Dictionary [home, info] Oort cloud: LookWAYup Translating Dictionary/Thesaurus [home, info] Oort cloud: Dictionary/thesaurus [home, info] Computing (1 matching dictionary) Oort cloud: Encyclopedia [home, info] Science (3 matching dictionaries) Oort Cloud: Eric Weisstein's World of Astronomy [home, info] Oort Cloud: Extragalactic Astronomy [home, info] OORT CLOUD: Zoom Astronomy Glossary [home, info] Slang (1 matching dictionary) Oort Cloud: Urban Dictionary [home, info] Tech (1 matching dictionary) Oort cloud: Basics of Space Flight Glossary [home, info]

Quick definitions from WordNet (Oort cloud) ▸ noun:  (astronomy) a hypothetical huge collection of comets orbiting the sun far beyond the orbit of Pluto; perturbations (as by other stars) can upset a comet's orbit and may send it tumbling toward the sun