We found 24 dictionaries that define the word decagon:

General (20 matching dictionaries)

1. decagon: Merriam-Webster
2. decagon: Oxford Learner's Dictionaries
3. decagon: American Heritage Dictionary of the English Language
4. decagon: Collins English Dictionary
5. decagon: Vocabulary.com
6. decagon: Wordnik
7. decagon: Wiktionary
8. decagon: Webster's New World College Dictionary, 4th Ed.
9. decagon: The Wordsmyth English Dictionary-Thesaurus
10. decagon: Infoplease Dictionary
11. decagon: Dictionary.com
12. Decagon: Wikipedia, the Free Encyclopedia
13. Decagon: Online Plain Text English Dictionary
14. decagon: Webster's Revised Unabridged, 1913 Edition
15. decagon: Rhymezone
16. Decagon: AllWords.com Multi-Lingual Dictionary
17. decagon: Webster's 1828 Dictionary
18. decagon: FreeDictionary.org
19. decagon: Mnemonic Dictionary
20. decagon: TheFreeDictionary.com

Art (1 matching dictionary)

21. decagon: ArtLex Lexicon of Visual Art Terminology

Computing (1 matching dictionary)

22. decagon: Encyclopedia

Medicine (1 matching dictionary)

23. online medical dictionary (No longer online)

Science (1 matching dictionary)

24. Decagon: Eric Weisstein's World of Mathematics

(Note: See decagons as well.)

Definitions from Wiktionary (decagon) ▸ noun:  (geometry) A polygon with ten sides and ten angles. Similar: undecagon, quindecagon, dodecagon, icosagon, hexadecagon, octacontagon, hendecagon, duodecagon, nonagon, enneadecagon, more... Opposite: pentagon, pentangle Phrases: regular decagon, more... Adjectives: regular, inscribed, required, irregular, equilateral, simple, equiangular, aperiodic, circumscribed, lofty, semi ▸ Words similar to decagon ▸ Usage examples for decagon ▸ Idioms related to decagon ▸ Wikipedia articles (New!) ▸ Popular adjectives describing decagon ▸ Words that often appear near decagon ▸ Rhymes of decagon ▸ Invented words related to decagon