We found 20 dictionaries that define the word knuckles:

General (13 matching dictionaries)

1. knuckles: Merriam-Webster
2. knuckles: Collins English Dictionary
3. knuckles: Vocabulary.com
4. Knuckles, knuckles: Wordnik
5. knuckles: Cambridge Advanced Learner's Dictionary
6. Knuckles, knuckles: Wiktionary
7. knuckles: Dictionary.com
8. knuckles: Cambridge Essential American English Dictionary
9. Knuckles: Wikipedia, the Free Encyclopedia
10. knuckles: Rhymezone
11. knuckles: FreeDictionary.org
12. knuckles: Mnemonic Dictionary
13. knuckles: TheFreeDictionary.com

Computing (1 matching dictionary)

14. knuckles: Encyclopedia

Medicine (2 matching dictionaries)

15. knuckles: Merriam-Webster Medical Dictionary
16. knuckles: Medical dictionary

Miscellaneous (2 matching dictionaries)

17. Brilliant Dream Dictionary (No longer online)
18. knuckles: Idioms

Slang (1 matching dictionary)

19. Knuckles: Urban Dictionary

Tech (1 matching dictionary)

20. National Weather Service Glossary (No longer online)

(Note: See knuckle as well.)

Definitions from Wiktionary (Knuckles) ▸ noun:  (US, archaic) A nickname for a man employed for his fistfighting skill. Similar: knuckle duster, brass knuckles, brass knucks, knucks, knucklenuts, fucknuckle, knucklehead, fuck-knuckle, knuckle dragger, knuckledragger, more... Types: brass knuckles, spiked knuckles, plastic knuckles, wooden knuckles, leather knuckles, titanium knuckles, more... Phrases: brass knuckles, white knuckles, bare knuckles, knuckles down, knuckles under, more... Adjectives: brass, white, bare, bony, hard, big, skinned, large, bloody, whitened, red ▸ Words similar to knuckles ▸ Usage examples for knuckles ▸ Idioms related to knuckles ▸ Wikipedia articles (New!) ▸ Popular adjectives describing knuckles ▸ Words that often appear near knuckles ▸ Rhymes of knuckles ▸ Invented words related to knuckles