We found 8 dictionaries that define the word outer planets:

General (6 matching dictionaries)

1. outer planets: Merriam-Webster
2. outer planets: Collins English Dictionary
3. outer planets: Vocabulary.com
4. outer planets: Wiktionary
5. Outer planets: Wikipedia, the Free Encyclopedia
6. outer planets: TheFreeDictionary.com

Computing (1 matching dictionary)

7. outer planets: Encyclopedia

Science (1 matching dictionary)

8. OUTER PLANETS: Zoom Astronomy Glossary

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