We found 40 dictionaries that define the word astronomy:

General (28 matching dictionaries)

1. astronomy: Merriam-Webster
2. astronomy: Oxford Learner's Dictionaries
3. astronomy: American Heritage Dictionary of the English Language
4. astronomy: Collins English Dictionary
5. astronomy: Vocabulary.com
6. Astronomy, astronomy: Wordnik
7. astronomy: Cambridge Advanced Learner's Dictionary
8. astronomy: Wiktionary
9. astronomy: Webster's New World College Dictionary, 4th Ed.
10. astronomy: The Wordsmyth English Dictionary-Thesaurus
11. astronomy: Infoplease Dictionary
12. astronomy: Dictionary.com
13. astronomy: Online Etymology Dictionary
14. astronomy: Cambridge Essential American English Dictionary
15. Astronomy (Bleach album), Astronomy (Dragonland album), Astronomy (disambiguation), Astronomy (magazine), Astronomy (song), Astronomy: Wikipedia, the Free Encyclopedia
16. Astronomy: Online Plain Text English Dictionary
17. astronomy: Webster's Revised Unabridged, 1913 Edition
18. astronomy: Rhymezone
19. astronomy: AllWords.com Multi-Lingual Dictionary
20. astronomy: Webster's 1828 Dictionary
21. astronomy: FreeDictionary.org
22. astronomy: Mnemonic Dictionary
23. astronomy: TheFreeDictionary.com
24. astronomy: Wikimedia Commons US English Pronunciations
25. astronomy: Longman Dictionary of Contemporary English
26. astronomy: Merriam-Webster

Business (1 matching dictionary)

27. astronomy: Legal dictionary

Computing (1 matching dictionary)

28. astronomy: Encyclopedia

Medicine (2 matching dictionaries)

29. Medical Dictionary (No longer online)
30. online medical dictionary (No longer online)

Religion (2 matching dictionaries)

31. Astronomy: Easton Bible
32. Astronomy: Catholic Encyclopedia

Science (4 matching dictionaries)

33. Archaeology Wordsmith (No longer online)
34. Astronomy: Extragalactic Astronomy
35. ASTRONOMY: Zoom Astronomy Glossary
36. Imagine the Universe! Dictionary (No longer online)

Slang (1 matching dictionary)

37. Astronomy: Urban Dictionary

Tech (1 matching dictionary)

38. High-Energy Astrophysics (No longer online)

(Note: See astronomies as well.)

Definitions from Wiktionary ( ) ▸ noun:  The study of the physical universe beyond the Earth's atmosphere, including the process of mapping locations and properties of the matter and radiation in the universe. ▸ noun:  (obsolete) Astrology. Similar: uranology, astrobiology, astrophysics, astrogeometry, astronomics, cosmology, aeronomy, ultraviolet astronomy, astrochemistry, optical astronomy, more... Opposite: geology, biology, chemistry, zoology, botany Types: astrology, astrophysics, cosmology, planetary science, galaxy, nebula, supernova, more... Phrases: radio astronomy, optical astronomy, infrared astronomy, practical astronomy, planetary astronomy, more... Adjectives: modern, new, ptolemaic, ray, practical, physical, mathematical, copernican, observational, ancient, greek Colors:     midnight blue,     cosmic latte,     nebula purple,     aurora green, more... ▸ Word origin ▸ Words similar to astronomy ▸ Usage examples for astronomy ▸ Idioms related to astronomy ▸ Wikipedia articles (New!) ▸ Popular adjectives describing astronomy ▸ Words that often appear near astronomy ▸ Rhymes of astronomy ▸ Invented words related to astronomy