We found 32 dictionaries that define the word octagon:

General (26 matching dictionaries)

1. octagon: Longman Dictionary of Contemporary English
2. octagon: Merriam-Webster
3. octagon: Oxford Learner's Dictionaries
4. octagon: American Heritage Dictionary of the English Language
5. octagon: Collins English Dictionary
6. octagon: Vocabulary.com
7. Octagon, octagon: Wordnik
8. octagon: Cambridge Advanced Learner's Dictionary
9. octagon: Wiktionary
10. octagon: Webster's New World College Dictionary, 4th Ed.
11. octagon: The Wordsmyth English Dictionary-Thesaurus
12. octagon: Infoplease Dictionary
13. octagon: Dictionary.com
14. octagon: Online Etymology Dictionary
15. octagon: Cambridge Essential American English Dictionary
16. OCTAGON, Octagon (Bathory album), Octagon (Ortigas Center), Octagon (Sports Agency), Octagon (disambiguation), Octagon (mixed martial arts), Octagon (sports agency), Octagon (video game), Octagon, The Octagon (Roosevelt Island), The Octagon (film), The Octagon: Wikipedia, the Free Encyclopedia
17. Octagon: Online Plain Text English Dictionary
18. octagon: Webster's Revised Unabridged, 1913 Edition
19. octagon: Rhymezone
20. octagon: AllWords.com Multi-Lingual Dictionary
21. octagon: Webster's 1828 Dictionary
22. octagon: FreeDictionary.org
23. octagon: Mnemonic Dictionary
24. octagon: TheFreeDictionary.com

Art (1 matching dictionary)

25. octagon: ArtLex Lexicon of Visual Art Terminology

Computing (1 matching dictionary)

26. octagon: Encyclopedia

Medicine (1 matching dictionary)

27. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

28. Brilliant Dream Dictionary (No longer online)

Science (1 matching dictionary)

29. Octagon: Eric Weisstein's World of Mathematics

Slang (1 matching dictionary)

30. The Octagon, octagon: Urban Dictionary

(Note: See octagonal as well.)

Definitions from Wiktionary ( ) ▸ noun:  (geometry, also attributively) A polygon with eight sides and eight angles. ▸ noun:  (martial arts) Often in the form Octagon: the arena for mixed martial arts. Similar: octogon, hexagon, quadrangle, heptagon, icosidigon, sexagon, enneacontagon, dihectagon, pentagon, octahedron, more... Opposite: pentagon Types: stop sign, trigon, tetragon, pentagon, hexagon, heptagon, nonagon, more... Phrases: Octagon house, regular octagon, Dr. Octagon, The Octagon House, Betrayed in the Octagon, more... Adjectives: regular, central, irregular, larger, inscribed, domed, inner, elongated, half, plain, perfect Colors:     red,     blue,     green,     yellow,     orange, more... ▸ Word origin ▸ Words similar to octagon ▸ Usage examples for octagon ▸ Idioms related to octagon ▸ Wikipedia articles (New!) ▸ Popular adjectives describing octagon ▸ Words that often appear near octagon ▸ Rhymes of octagon ▸ Invented words related to octagon