We found 26 dictionaries that define the word octo:

General (19 matching dictionaries)

1. octo: Longman Dictionary of Contemporary English
2. octo-: Merriam-Webster
3. octo-: Oxford Learner's Dictionaries
4. octo-: American Heritage Dictionary of the English Language
5. octo-, octo-: Collins English Dictionary
6. Octo, octo, octo-: Wordnik
7. octo-: Wiktionary
8. octo-: Webster's New World College Dictionary, 4th Ed.
9. octo (oct or octa-): The Wordsmyth English Dictionary-Thesaurus
10. octo-: Infoplease Dictionary
11. OCTO, Octo-, octo-: Dictionary.com
12. octo-: Online Etymology Dictionary
13. Octo-, Octo (automobile), Octo: Wikipedia, the Free Encyclopedia
14. Octo-: Online Plain Text English Dictionary
15. Octo-: AllWords.com Multi-Lingual Dictionary
16. octo, octo-: MyWord.info
17. octo: Stammtisch Beau Fleuve Acronyms
18. octo-: FreeDictionary.org
19. octo-: TheFreeDictionary.com

Art (1 matching dictionary)

20. octo-: A Cross Reference of Latin and Greek Elements

Medicine (2 matching dictionaries)

21. online medical dictionary (No longer online)
22. octo-: Medical dictionary

Miscellaneous (1 matching dictionary)

23. OCTO: Acronym Finder

Science (1 matching dictionary)

24. octo: Dictionary of Botanical Epithets

Slang (2 matching dictionaries)

25. octo: Green’s Dictionary of Slang
26. Octo, octo: Urban Dictionary

Definitions from Wikipedia (Octo) ▸ noun:  a French automobile manufactured at Courbevoie by Louis Vienne between 1921 and 1928.Linz, Schrader: Die Internationale Automobil-Enzyklopädie. Phrases: octo mom, Octo Octa, more... Adjectives: early, late, spry, young, ultra, 25th ▸ Word origin ▸ Words similar to octo ▸ Usage examples for octo ▸ Idioms related to octo ▸ Wikipedia articles (New!) ▸ Popular adjectives describing octo ▸ Words that often appear near octo ▸ Rhymes of octo ▸ Invented words related to octo