We found 14 dictionaries that define the word hair's breadth:

General (11 matching dictionaries)

1. hair's breadth: Merriam-Webster
2. hair's-breadth, hair's-breadth, hair's breadth, hair's breadth: Collins English Dictionary
3. hair's-breadth: Vocabulary.com
4. hair's-breadth: Wordnik
5. hair's breadth: Wiktionary
6. hair's-breadth, hair's breadth, hairs-breadth, hairs breadth: Dictionary.com
7. Hair's breadth: Wikipedia, the Free Encyclopedia
8. hair's-breadth: Rhymezone
9. hairs-breadth: FreeDictionary.org
10. hair's-breadth: Mnemonic Dictionary
11. hair's-breadth, hair's breadth: TheFreeDictionary.com

Computing (1 matching dictionary)

12. hair's-breadth: Encyclopedia

Science (1 matching dictionary)

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

Slang (1 matching dictionary)

14. hair's breadth: Urban Dictionary

Definitions from Wiktionary (hair's breadth) ▸ noun:  (idiomatic) A very small amount or distance. Phrases: a hairs breadth, more... ▸ Words similar to hair's breadth ▸ Usage examples for hair's breadth ▸ Idioms related to hair's breadth ▸ Wikipedia articles (New!) ▸ Words that often appear near hair's breadth ▸ Rhymes of hair's breadth ▸ Invented words related to hair's breadth