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We found 31 dictionaries with English definitions that include the word jackknife:
Click on the first link on a line below to go directly to a page where "jackknife" is defined.

General (25 matching dictionaries)

1. jackknife: Merriam-Webster.com [home, info]
2. jackknife: Oxford Learner's Dictionaries [home, info]
3. jackknife: American Heritage Dictionary of the English Language [home, info]
4. jackknife: Collins English Dictionary [home, info]
5. jackknife: Vocabulary.com [home, info]
6. Jackknife, jackknife: Wordnik [home, info]
7. jackknife: Wiktionary [home, info]
8. jackknife: Webster's New World College Dictionary, 4th Ed. [home, info]
9. jackknife: The Wordsmyth English Dictionary-Thesaurus [home, info]
10. jackknife: Infoplease Dictionary [home, info]
11. Jackknife, jackknife: Dictionary.com [home, info]
12. jackknife: UltraLingua English Dictionary [home, info]
13. jackknife: Cambridge Dictionary of American English [home, info]
14. Jackknife (disambiguation), Jackknife (exercise), Jackknife (statistics), Jackknife (truck tractor and trailer), Jackknife: Wikipedia, the Free Encyclopedia [home, info]
15. Jackknife: Online Plain Text English Dictionary [home, info]
16. jackknife: Webster's Revised Unabridged, 1913 Edition [home, info]
17. jackknife: Rhymezone [home, info]
18. Jackknife: AllWords.com Multi-Lingual Dictionary [home, info]
19. jackknife: Free Dictionary [home, info]
20. jackknife: Mnemonic Dictionary [home, info]
21. jackknife: WordNet 1.7 Vocabulary Helper [home, info]
22. jackknife: LookWAYup Translating Dictionary/Thesaurus [home, info]
23. jackknife: Dictionary/thesaurus [home, info]

Business (1 matching dictionary)

24. Jackknife: Glossary of Trucking Terms [home, info]

Computing (1 matching dictionary)

25. jackknife: Encyclopedia [home, info]

Science (2 matching dictionaries)

26. Jackknife: Eric Weisstein's World of Mathematics [home, info]
27. Jackknife: GLOSSARY OF ORDINATION-RELATED TERMS [home, info]

Slang (1 matching dictionary)

28. jackknife: Urban Dictionary [home, info]

Sports (1 matching dictionary)

29. jackknife: Extreme Martial Arts Glosary [home, info]

(Note: See jackknives for more definitions.)

Quick definitions from Macmillan ( ) Provided by Quick definitions from WordNet (jackknife) ▸ noun:  a dive in which the diver bends to touch the ankles before straightening out ▸ noun:  a large knife with one or more folding blades ▸ verb:  dive into the water bending the body at the waist at a right angle, like a jackknife ▸ Also see jackknives ▸ Words similar to jackknife ▸ Usage examples for jackknife ▸ Idioms related to jackknife (New!) ▸ Popular adjectives describing jackknife ▸ Words that often appear near jackknife ▸ Rhymes of jackknife ▸ Invented words related to jackknife