We found 15 dictionaries that define the word backbones:

General (10 matching dictionaries)

1. backbones: Merriam-Webster
2. backbones: Collins English Dictionary
3. backbones: Vocabulary.com
4. backbones: Wordnik
5. backbones: Cambridge Advanced Learner's Dictionary
6. backbones: Wiktionary
7. backbones: Dictionary.com
8. backbones: Cambridge Essential American English Dictionary
9. Backbones (album): Wikipedia, the Free Encyclopedia
10. backbones: TheFreeDictionary.com

Business (1 matching dictionary)

11. backbones: Legal dictionary

Computing (1 matching dictionary)

12. backbones: Encyclopedia

Medicine (2 matching dictionaries)

13. backbones: Merriam-Webster Medical Dictionary
14. backbones: Medical dictionary

Slang (1 matching dictionary)

15. Backbones: Urban Dictionary

(Note: See backbone as well.)

Definitions from Wikipedia (Backbones) ▸ noun:  a 2004 live compilation album released by Wishbone Ash. Opposite: spinelessness, weakness, timidity, meekness Phrases: animals with backbones, more... Adjectives: phosphate, speed, different, national, flexible, rigid, multiple, conjugated, major, optic, large ▸ Words similar to backbones ▸ Usage examples for backbones ▸ Idioms related to backbones ▸ Wikipedia articles (New!) ▸ Popular adjectives describing backbones ▸ Words that often appear near backbones ▸ Rhymes of backbones ▸ Invented words related to backbones