We found 22 dictionaries that define the word heptad:

General (19 matching dictionaries)

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

Computing (1 matching dictionary)

20. heptad: Encyclopedia

Medicine (1 matching dictionary)

21. online medical dictionary (No longer online)

Science (1 matching dictionary)

22. How Many? A Dictionary of Units of Measurement (No longer online)

(Note: See heptads as well.)

Definitions from Wiktionary (heptad) ▸ noun:  Synonym of septet: a group of seven things. ▸ noun:  (genetics) A sequence of seven bases. Similar: septet, seven, vii, Sevener, heptade, heptet, heptuple, septenary, septuor, septuple, more... Phrases: heptad repeat, more... Adjectives: ninth, hydrophobic, second, terminal, first, divine, conserved, coil ▸ Words similar to heptad ▸ Usage examples for heptad ▸ Idioms related to heptad ▸ Wikipedia articles (New!) ▸ Popular adjectives describing heptad ▸ Words that often appear near heptad ▸ Rhymes of heptad ▸ Invented words related to heptad