We found 31 dictionaries that define the word heptagon:

General (25 matching dictionaries)

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

Art (1 matching dictionary)

24. heptagon: ArtLex Lexicon of Visual Art Terminology

Computing (1 matching dictionary)

25. heptagon: Encyclopedia

Medicine (1 matching dictionary)

26. online medical dictionary (No longer online)

Science (3 matching dictionaries)

27. A Glossary of Mathematical Terms (No longer online)
28. Heptagon: Eric Weisstein's World of Mathematics
29. heptagon: MATH SPOKEN HERE!

(Note: See heptagonal as well.)

Definitions from Wiktionary ( ) ▸ noun:  A polygon with seven sides and seven angles. Similar: hexagon, heptahedron, dihectagon, octagon, pentagon, hectagon, hectogon, tetrakaidecagon, heptangle, sexagon, more... Opposite: hexagon, octagon, nonagon, decagon Types: septagon, more... Phrases: regular heptagon, more... Adjectives: regular, irregular, equilateral, inscribed, national, similar, outer ▸ Word origin ▸ Words similar to heptagon ▸ Usage examples for heptagon ▸ Idioms related to heptagon ▸ Wikipedia articles (New!) ▸ Popular adjectives describing heptagon ▸ Words that often appear near heptagon ▸ Rhymes of heptagon ▸ Invented words related to heptagon