We found 30 dictionaries that define the word stiffen:

General (24 matching dictionaries)

1. stiffen: Longman Dictionary of Contemporary English
2. stiffen: Merriam-Webster
3. stiffen: Oxford Learner's Dictionaries
4. stiffen: American Heritage Dictionary of the English Language
5. stiffen: Collins English Dictionary
6. stiffen: Vocabulary.com
7. Stiffen, stiffen: Wordnik
8. stiffen: Cambridge Advanced Learner's Dictionary
9. stiffen: Wiktionary
10. stiffen: Webster's New World College Dictionary, 4th Ed.
11. stiffen: The Wordsmyth English Dictionary-Thesaurus
12. stiffen: Infoplease Dictionary
13. stiffen: Dictionary.com
14. stiffen: Cambridge Essential American English Dictionary
15. Stiffen: Online Plain Text English Dictionary
16. stiffen: Webster's Revised Unabridged, 1913 Edition
17. stiffen: Rhymezone
18. stiffen: AllWords.com Multi-Lingual Dictionary
19. stiffen: Webster's 1828 Dictionary
20. stiffen: FreeDictionary.org
21. stiffen: Mnemonic Dictionary
22. stiffen: TheFreeDictionary.com

Business (1 matching dictionary)

23. stiffen: Legal dictionary

Computing (1 matching dictionary)

24. stiffen: Encyclopedia

Medicine (1 matching dictionary)

25. online medical dictionary (No longer online)

Miscellaneous (1 matching dictionary)

26. stiffen: Idioms

Slang (1 matching dictionary)

27. stiffen, stiffen: Green’s Dictionary of Slang

Tech (1 matching dictionary)

28. Book Binding (No longer online)

(Note: See stiffened as well.)

Definitions from Wiktionary ( ) ▸ verb:  (transitive) To make stiff. ▸ verb:  (intransitive) To become stiff. Similar: tighten, tighten up, constrain, rigidize, rigidify, restiffen, rigidise, stouten, toughen, ossify, more... Opposite: relax, loosen, unwind Phrases: stiffen up, stiffen with resentment, more... Adjectives: young, particular, other, joint, frozen, concrete Colors:     gray,     charcoal,     iron,     lead,     pewter, more... ▸ Words similar to stiffen ▸ Usage examples for stiffen ▸ Idioms related to stiffen ▸ Wikipedia articles (New!) ▸ Words that often appear near stiffen ▸ Rhymes of stiffen ▸ Invented words related to stiffen