We found 21 dictionaries that define the word planets:

General (13 matching dictionaries)

1. planets: Longman Dictionary of Contemporary English
2. planets: Merriam-Webster
3. planets: Collins English Dictionary
4. planets: Vocabulary.com
5. Planet's, Planets, planet's, planets, planets: Wordnik
6. planets: Cambridge Advanced Learner's Dictionary
7. planets: Wiktionary
8. planets: Dictionary.com
9. planets: Cambridge Essential American English Dictionary
10. Planets (Adema album), Planets (EP), Planets (Eloy album), Planets, The Planets (Holst), The Planets (band), The Planets, The planets: Wikipedia, the Free Encyclopedia
11. Planets: Dictionary of Phrase and Fable (1898)
12. planets: FreeDictionary.org
13. Planets: TheFreeDictionary.com

Art (1 matching dictionary)

14. Banjo Glossary (No longer online)

Computing (1 matching dictionary)

15. Planets: Encyclopedia

Medicine (2 matching dictionaries)

16. Medical Dictionary (No longer online)
17. online medical dictionary (No longer online)

Science (1 matching dictionary)

18. From Stargazers to Starships Glossary (No longer online)

Slang (2 matching dictionaries)

19. planets: Green’s Dictionary of Slang
20. Planets: Urban Dictionary

Tech (1 matching dictionary)

21. AUTOMOTIVE TERMS (No longer online)

(Note: See planet as well.)

Definitions from Wikipedia (Planets) ▸ noun:  the third studio album by the American rock band Adema. ▸ noun:  "Planets" is a song by Australian pop punk band, Short Stack. ▸ noun:  the ninth studio album by the German rock band Eloy, released in 1981. Opposite: stars, voids, asteroids, comets, galaxies Types: terrestrial, gas giant, ice giant, dwarf planet, more... Phrases: outer planets, terrestrial planets, giant planets, inner planets, minor planets, more... Adjectives: other, outer, terrestrial, minor, giant, different, inner, major, several, distant, various ▸ Words similar to planets ▸ Usage examples for planets ▸ Idioms related to planets ▸ Wikipedia articles (New!) ▸ Popular adjectives describing planets ▸ Words that often appear near planets ▸ Rhymes of planets ▸ Invented words related to planets