We found 40 dictionaries that define the word aphelion:

General (23 matching dictionaries)

1. aphelion: Merriam-Webster
2. aphelion: Oxford Learner's Dictionaries
3. aphelion: American Heritage Dictionary of the English Language
4. aphelion: Collins English Dictionary
5. aphelion: Vocabulary.com
6. Aphelion, aphelion: Wordnik
7. aphelion: Wiktionary
8. aphelion: Webster's New World College Dictionary, 4th Ed.
9. aphelion: The Wordsmyth English Dictionary-Thesaurus
10. aphelion: Infoplease Dictionary
11. aphelion: Dictionary.com
12. aphelion: Online Etymology Dictionary
13. Aphelion (Edenbridge album), Aphelion (disambiguation), Aphelion (software), Aphelion: Wikipedia, the Free Encyclopedia
14. Aphelion: Online Plain Text English Dictionary
15. aphelion: Webster's Revised Unabridged, 1913 Edition
16. aphelion: Rhymezone
17. Aphelion: AllWords.com Multi-Lingual Dictionary
18. aphelion: Webster's 1828 Dictionary
19. aphelion: Stammtisch Beau Fleuve Acronyms
20. aphelion: FreeDictionary.org
21. aphelion: Mnemonic Dictionary
22. aphelion: TheFreeDictionary.com
23. aphelion: Merriam-Webster

Computing (1 matching dictionary)

24. aphelion: Encyclopedia

Medicine (1 matching dictionary)

25. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

26. aphelion: A Word A Day

Science (7 matching dictionaries)

27. From Stargazers to Starships Glossary (No longer online)
28. Aphelion: Eric Weisstein's World of Astronomy
29. Imagine the Universe! Dictionary (No longer online)
30. Mars Glossary (No longer online)
31. Aphelion: Extragalactic Astronomy
32. aphelion: Nine Planets Glossary
33. APHELION: Zoom Astronomy Glossary

Slang (1 matching dictionary)

34. aphelion: Urban Dictionary

Tech (6 matching dictionaries)

35. High-Energy Astrophysics (No longer online)
36. Basics of Space Flight Glossary (No longer online)
37. Glossary of Meteorology (No longer online)
38. JPL Terms (No longer online)
39. National Weather Service Glossary (No longer online)
40. SOLAR-TERRESTRIAL TERMS (No longer online)

(Note: See aphelia as well.)

Definitions from Wiktionary (aphelion) ▸ noun:  (astronomy, also figuratively) The point in the elliptical orbit of a comet, planet, or other astronomical object, where it is farthest from the Sun. Similar: perihelion, apsis, apocenter, apogee, apastron, apoherm, apocentre, apex, apoastron, apobaryon, more... Opposite: perihelion, closest approach Types: aphelion of Earth, aphelion of Mars, aphelion of Jupiter, aphelion of Saturn, aphelion of Uranus, aphelion of Neptune, aphelion of Pluto, more... Adjectives: near, remotest, cometary, vast, imaginary, future, compare, special, dark, real, far Colors:     burnt orange,     midnight blue,     deep space black,     cosmic purple,     celestial white, more... ▸ Word origin ▸ Words similar to aphelion ▸ Usage examples for aphelion ▸ Idioms related to aphelion ▸ Wikipedia articles (New!) ▸ Popular adjectives describing aphelion ▸ Words that often appear near aphelion ▸ Rhymes of aphelion ▸ Invented words related to aphelion