We found 23 dictionaries that define the word octad:

General (19 matching dictionaries)

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

Computing (1 matching dictionary)

20. octad: Encyclopedia

Medicine (1 matching dictionary)

21. online medical dictionary (No longer online)

Science (2 matching dictionaries)

22. octad: PlanetMath Encyclopedia
23. How Many? A Dictionary of Units of Measurement (No longer online)

(Note: See octads as well.)

Definitions from Wiktionary (octad) ▸ noun:  A group of eight things. ▸ noun:  (historical) hundred million = myriad myriad; 100,000,000 = 10⁸ Similar: ogdoad, octonary, eight, octet, eighter from Decatur, eighter, viii, octuplet, eightsome, octuple, more... Opposite: monad, duad, triad, tetrad, pentad, hexad, heptad, nonad ▸ Words similar to octad ▸ Usage examples for octad ▸ Idioms related to octad ▸ Wikipedia articles (New!) ▸ Popular adjectives describing octad ▸ Words that often appear near octad ▸ Rhymes of octad ▸ Invented words related to octad